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• avcodec/h2645_parse : Move ref_idc further up in H2645NAL

  11 décembre 2021, par Andreas Rheinhardt

  avcodec/h2645_parse : Move ref_idc further up in H2645NAL
  This puts it directly near the NALU type which is more natural
  
  and furthermore reduces the size of the structure because it
  
  can be placed in padding (on 64-bit systems).
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
  

  • [DH] libavcodec/h2645_parse.h

• Fragmented mp4 file is not played by MSE

  19 mai 2020, par Daniel

  I created a fragmented mp4 file with ffmpeg (from h264), and removed the first 6 moof and mdat pairs.

  



  So now it still has the correct order of boxes : ftyp, moov, moof, mdat, moof, mdat, ..., but the first moof packet has the sequenceNumber of 7.

  



  VLC can play it fine, 'Movies & TV' can also play, but the first some seconds are black.

  



  If I drag the file into the browser, it can also play it fine.

  



  It is however not being displayed at all in the browser (Chrome) if I feed it via MSE.

  



  No error messages are printed, and in the media-internals' log it can be seen that the videoplayer starts playing in the first second and suspends it only in the 18th second :

  



  Timestamp   Property    Value
00:00:00.000    origin_url  "https://localhost:8443/"
00:00:00.000    kFrameUrl   "https://localhost:8443/websocket/videodemo.html"
00:00:00.000    kFrameTitle "WebSocket and MSE demo"
00:00:00.000    url "blob:https://localhost:8443/3b4d4b1a-7c08-4136-95fe-dabc14fba95f"
00:00:00.000    info    "ChunkDemuxer"
00:00:00.000    pipeline_state  "kStarting"
00:00:01.067    kVideoTracks    [{"alpha mode":"is_opaque","codec":"h264","coded size":"1600x900","color space":"{primaries:BT709, transfer:BT709, matrix:BT709, range:LIMITED}","encryption scheme":"Unencrypted","flipped":false,"has_extra_data":false,"natural size":"1600x900","profile":"h264 main","rotation":"0°","visible rect":"0,0 1600x900"}]
00:00:01.067    debug   "Video rendering in low delay mode."
00:00:01.070    info    "Using D3D11 device for DXVA"
00:00:01.075    kIsVideoDecryptingDemuxerStream false
00:00:01.075    kVideoDecoderName   "MojoVideoDecoder"
00:00:01.075    kIsPlatformVideoDecoder true
00:00:01.075    info    "Selected MojoVideoDecoder for video decoding, config: codec: h264, profile: h264 main, alpha_mode: is_opaque, coded size: [1600,900], visible rect: [0,0,1600,900], natural size: [1600,900], has extra data: false, encryption scheme: Unencrypted, rotation: 0°, flipped: 0, color space: {primaries:BT709, transfer:BT709, matrix:BT709, range:LIMITED}"
00:00:01.075    pipeline_state  "kPlaying"
00:00:01.067    duration    "unknown"
00:00:18.926    pipeline_state  "kSuspending"
00:00:18.926    pipeline_state  "kSuspended"
00:00:18.927    event   "SUSPENDED"


  



  Here is the video file for reference.

  



  What is the problem with this file, why is it not displayed in the browser with MSE ?

  


• avcodec/smcenc : Move PutByteContext to stack

  19 novembre 2021, par Andreas Rheinhardt

  avcodec/smcenc : Move PutByteContext to stack
  This context is transient, so putting it on the stack is more natural.
  
  Also reduces codesize : 24E6->2296 B with GCC 10 and -O3.
  Reviewed-by : Paul B Mahol <onemda@gmail.com>
  
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
  

  • [DH] libavcodec/smcenc.c