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platform-decode §2 reads the query a page asks the platform from the payload of every capability browser-sink §4.1 gives a user-agent decoder, not only AV1 and HEVC. §2.1 adds VP9 (the codec string from the first key frame's uncompressed header, the level from VP9's level table over the frame size and the mean rate of the IVF timestamps, the matrix of its colour space), AVC (avc1 and the SPS's profile, constraint byte and level, the size after the cropping rectangle) and VP8. §2.2 adds the audio query, asked of AudioDecoder.isConfigSupported and of decodingInfo with an AudioConfiguration: Ogg Opus (its OpusHead the description), one Opus packet (the TOC byte), FLAC (STREAMINFO; the marker and metadata the description) and AAC in ADTS (mp4a.40.<object type>, or mp4a.66 to mp4a.68 for MPEG-2). §2.3 reads, by the same readers, the chunks a page gives the decoder and which of them are key. §3: answers to several configurations under one codec string are merged, so no object is routed to a decoder that refused its configuration. browser-sink §3 takes the audio answers into the report; §14.3 has the composing page ask about every alternative platform-decode maps and decode one routed ua through WebCodecs from §2.3's chunks. wai::platform_decode: Query::Video and Query::Audio, chunks, chunks_json, merge_answers, media_of. wai-web: platformMapped, platformChunks, platformMerge; compose.js asks and decodes through them for every mapped capability, video and audio. platform-decode-conformance/queries.json: the query and chunk summary of real payloads of every mapped capability (payloads/, written by payloads/make.sh with an independent prober's readings in prober.tsv, and the identify and encode corpora's streams), and planted faults with their outcomes. live-conformance/browser_sink_verify.py, given that directory, recomputes every case with its own readers and requires every mutated copy to fail. verify_platform_decode.mjs reads every payload through the wasm32 build in Chromium and WebKit and decodes it where the platform accepts its configuration; platform-decode §5 records the run. Co-Authored-By: Claude Opus 5.5 <[email protected]>
920 lines
23 KiB
JSON
920 lines
23 KiB
JSON
{
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"about": "platform-decode \u00a72: the query a sink reads from an entry's payload, and \u00a72.3: the chunks it gives the decoder. payload_file names a WAI1 envelope under wai/ whose payload is the entry's; payload_raw a file whose bytes are the payload; sps_hex is an HEVC SPS NAL unit, header included, as an Annex B stream carries it. rate is the presentation rate a sink gives a payload that states none. mutate is a planted fault: [byte offset, bits flipped] edits of the payload before it is read. expect holds members of the query's JSON form (platform_decode::query_json), chunks the summary of its chunks (platform_decode::chunks_json), and refused: true a payload that gives no query or no chunks. The two AV1 objects are floor objects of the packaging corpus (SPEC \u00a75's AV1 framing); their codec string is the one the packager wrote into the pack's HLS master. The SPS is the one the platform's HEVC encoder wrote through WebCodecs, configured as hvc1.1.6.L93.B0 for 640x360 with prefer-hardware (a hint the user agent may ignore, so nothing here says which encoder ran): it states general_level_idc 63 (level 2.1), and the codec string the encoder declared for its output repeated the configured one. The other payloads were written by real encoders and muxers: identify-conformance/ext/ (its tools/make_external.sh), encode-conformance/streams/ (the platform's and a software encoder), and payloads/ (payloads/make.sh; payloads/prober.tsv is what an independent media prober read of each).",
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"cases": [
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{
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"id": "corpus-floor-object-60-units",
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"capability": "wai.video.av1",
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"payload_file": "pack-conformance/packs/video-base-01/package/objects/35c7a45323b7afe979c123fa885f35cc55fabd2a1954759aebe4b95dbc76361f.wai",
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"expect": {
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"codec": "av01.0.00M.08",
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"width": 64,
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"height": 36,
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"codedWidth": 64,
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"codedHeight": 36,
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"framerate": [
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25,
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1
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],
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"bitrate": 7230,
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"bitDepth": 8
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}
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},
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{
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"id": "corpus-floor-object-40-units",
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"capability": "wai.video.av1",
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"payload_file": "pack-conformance/packs/video-base-01/package/objects/761c4649427c51796a2b699568775765b209ee80d2f4fc1cf040838c6724aa2d.wai",
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"expect": {
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"codec": "av01.0.00M.08",
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"width": 64,
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"height": 36,
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"codedWidth": 64,
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"codedHeight": 36,
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"framerate": [
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25,
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1
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],
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"bitrate": 8715,
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"bitDepth": 8
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}
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},
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{
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"id": "platform-encoder-sps",
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"capability": "wai.video.hevc",
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"sps_hex": "420101016000000300b0000003000003003fa005020171f2e206ee45914bff2e7f13fa9b8086808040",
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"expect": {
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"codec": "hev1.1.6.L63.B0",
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"width": 640,
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"height": 360,
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"codedWidth": 640,
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"codedHeight": 368,
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"bitDepth": 8
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}
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},
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{
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"id": "vp9-profile-0",
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"capability": "wai.video.vp9",
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"payload_raw": "identify-conformance/ext/vp9.ivf",
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"expect": {
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"media": "video",
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"codec": "vp09.00.10.08",
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"width": 32,
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"height": 32,
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"codedWidth": 32,
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"codedHeight": 32,
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"framerate": [
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10,
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1
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],
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"bitrate": 21627,
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"bitDepth": 8,
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"decodingConfiguration": {
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"type": "media-source",
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"video": {
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"contentType": "video/mp4; codecs=\"vp09.00.10.08\"",
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"width": 32,
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"height": 32,
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"bitrate": 21627,
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"framerate": 10.0
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}
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}
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},
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"chunks": {
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"chunks": 3,
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"keys": 1,
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"firstKey": true,
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"bytes": 743,
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"samples": null,
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"descriptionBytes": null
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}
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},
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{
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"id": "vp9-profile-1-444",
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"capability": "wai.video.vp9",
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"payload_raw": "platform-decode-conformance/payloads/vp9-444.ivf",
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"expect": {
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"media": "video",
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"codec": "vp09.01.10.08.03.01.01.01.00",
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"width": 48,
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"height": 32,
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"codedWidth": 48,
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"codedHeight": 32,
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"framerate": [
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30000,
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1001
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],
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"bitrate": 110983,
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"bitDepth": 8,
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"decodingConfiguration": {
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"type": "media-source",
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"video": {
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"contentType": "video/mp4; codecs=\"vp09.01.10.08.03.01.01.01.00\"",
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"width": 48,
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"height": 32,
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"bitrate": 110983,
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"framerate": 29.97002997002997
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}
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}
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},
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"chunks": {
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"chunks": 9,
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"keys": 3,
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"firstKey": true,
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"bytes": 4026,
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"samples": null,
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"descriptionBytes": null
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}
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},
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{
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"id": "vp9-profile-2-10-bit-bt2020-full-range",
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"capability": "wai.video.vp9",
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"payload_raw": "platform-decode-conformance/payloads/vp9-10bit.ivf",
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"expect": {
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"media": "video",
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"codec": "vp09.02.10.10.01.01.01.09.01",
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"width": 64,
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"height": 36,
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"codedWidth": 64,
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"codedHeight": 36,
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"framerate": [
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25,
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1
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],
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"bitrate": 57440,
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"bitDepth": 10,
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"decodingConfiguration": {
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"type": "media-source",
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"video": {
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"contentType": "video/mp4; codecs=\"vp09.02.10.10.01.01.01.09.01\"",
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"width": 64,
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"height": 36,
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"bitrate": 57440,
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"framerate": 25.0
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}
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}
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},
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"chunks": {
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"chunks": 10,
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"keys": 2,
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"firstKey": true,
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"bytes": 2720,
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"samples": null,
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"descriptionBytes": null
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}
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},
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{
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"id": "vp8",
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"capability": "wai.video.vp8",
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"payload_raw": "platform-decode-conformance/payloads/vp8.ivf",
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"expect": {
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"media": "video",
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"codec": "vp8",
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"width": 64,
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"height": 36,
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"codedWidth": 64,
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"codedHeight": 36,
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"framerate": [
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25,
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1
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],
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"bitrate": 73220,
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"bitDepth": 8,
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"decodingConfiguration": {
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"type": "media-source",
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"video": {
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"contentType": "video/mp4; codecs=\"vp8\"",
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"width": 64,
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"height": 36,
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"bitrate": 73220,
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"framerate": 25.0
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}
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}
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},
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"chunks": {
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"chunks": 10,
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"keys": 2,
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"firstKey": true,
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"bytes": 3509,
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"samples": null,
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"descriptionBytes": null
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}
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},
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{
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"id": "avc-constrained-baseline",
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"capability": "wai.video.avc",
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"payload_raw": "identify-conformance/ext/avc.h264",
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"rate": [
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10,
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1
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],
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"expect": {
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"media": "video",
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"codec": "avc1.42C00A",
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"width": 32,
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"height": 32,
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"codedWidth": 32,
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"codedHeight": 32,
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"framerate": [
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10,
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1
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],
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"bitrate": 35387,
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"bitDepth": 8,
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"decodingConfiguration": {
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"type": "media-source",
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"video": {
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"contentType": "video/mp4; codecs=\"avc1.42C00A\"",
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"width": 32,
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"height": 32,
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"bitrate": 35387,
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"framerate": 10.0
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}
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}
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},
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"chunks": {
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"chunks": 3,
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"keys": 1,
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"firstKey": true,
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"bytes": 1327,
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"samples": null,
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"descriptionBytes": null
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}
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},
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{
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"id": "avc-high-b-frames-cropped",
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"capability": "wai.video.avc",
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"payload_raw": "platform-decode-conformance/payloads/avc-high.h264",
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"rate": [
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25,
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1
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],
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"expect": {
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"media": "video",
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"codec": "avc1.64000A",
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"width": 64,
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"height": 36,
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"codedWidth": 64,
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"codedHeight": 48,
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"framerate": [
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25,
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1
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],
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"bitrate": 45920,
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"bitDepth": 8,
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"decodingConfiguration": {
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"type": "media-source",
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"video": {
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"contentType": "video/mp4; codecs=\"avc1.64000A\"",
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"width": 64,
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"height": 36,
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"bitrate": 45920,
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"framerate": 25.0
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}
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}
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},
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"chunks": {
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"chunks": 10,
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"keys": 2,
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"firstKey": true,
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"bytes": 2296,
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"samples": null,
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"descriptionBytes": null
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}
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},
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{
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"id": "avc-platform-encoder",
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"capability": "wai.video.avc",
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"payload_raw": "encode-conformance/streams/platform-avc.h264",
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"rate": [
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30,
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1
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],
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"expect": {
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"media": "video",
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"codec": "avc1.64000C",
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"width": 256,
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"height": 144,
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"codedWidth": 256,
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"codedHeight": 144,
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"framerate": [
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30,
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1
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],
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"bitrate": 611260,
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"bitDepth": 8,
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"decodingConfiguration": {
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"type": "media-source",
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"video": {
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"contentType": "video/mp4; codecs=\"avc1.64000C\"",
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"width": 256,
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"height": 144,
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"bitrate": 611260,
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"framerate": 30.0
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}
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}
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},
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"chunks": {
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"chunks": 12,
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"keys": 3,
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"firstKey": true,
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"bytes": 30563,
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"samples": null,
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"descriptionBytes": null
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}
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},
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{
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"id": "avc-software-encoder-128x72",
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"capability": "wai.video.avc",
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"payload_raw": "encode-conformance/streams/software-avc-128x72.h264",
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"rate": [
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30,
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1
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],
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"expect": {
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"media": "video",
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"codec": "avc1.640C0C",
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"width": 128,
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"height": 72,
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"codedWidth": 128,
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"codedHeight": 80,
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"framerate": [
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30,
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1
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],
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"bitrate": 204280,
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"bitDepth": 8,
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"decodingConfiguration": {
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"type": "media-source",
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"video": {
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"contentType": "video/mp4; codecs=\"avc1.640C0C\"",
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"width": 128,
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"height": 72,
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"bitrate": 204280,
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"framerate": 30.0
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}
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}
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},
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"chunks": {
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"chunks": 12,
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"keys": 3,
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"firstKey": true,
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"bytes": 10214,
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"samples": null,
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"descriptionBytes": null
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}
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},
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{
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"id": "hevc-stream",
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"capability": "wai.video.hevc",
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"payload_raw": "identify-conformance/ext/hevc.h265",
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"rate": [
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10,
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1
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],
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"expect": {
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"media": "video",
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"codec": "hev1.1.6.L30.90",
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"width": 32,
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"height": 32,
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"codedWidth": 32,
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"codedHeight": 32,
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"framerate": [
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10,
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1
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],
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"bitrate": 14827,
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"bitDepth": 8,
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"decodingConfiguration": {
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"type": "media-source",
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"video": {
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"contentType": "video/mp4; codecs=\"hev1.1.6.L30.90\"",
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"width": 32,
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"height": 32,
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"bitrate": 14827,
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"framerate": 10.0
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}
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}
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},
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"chunks": {
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"chunks": 3,
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"keys": 1,
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"firstKey": true,
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"bytes": 556,
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"samples": null,
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"descriptionBytes": null
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}
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},
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{
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"id": "hevc-platform-encoder",
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"capability": "wai.video.hevc",
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"payload_raw": "encode-conformance/streams/platform-hevc.h265",
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"rate": [
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30,
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1
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],
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"expect": {
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"media": "video",
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"codec": "hev1.1.6.L60.B0",
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"width": 256,
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"height": 144,
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"codedWidth": 256,
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"codedHeight": 144,
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"framerate": [
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30,
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1
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],
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"bitrate": 632520,
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"bitDepth": 8,
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"decodingConfiguration": {
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"type": "media-source",
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"video": {
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{
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