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• yuv420p10le format using ffmpeg without green background in web browser

  16 août 2021, par OneWorld

  I just rebuilt ffmpeg, and generated a yuv420p10le video. Below is a snapshot from the video.

  


  

  


  It seems to display a green background in chrome when I play it. However, if I switch hardware acceleration off in Chrome, the background appears white. Also if I play the video in VLC player the background is white.

  


  I was wondering if there is a way within ffmpeg to get yuv420p10le to show backgrounds as white in browsers without needing to do anything special in the browser settings ?

  


  My ffmpeg configuration is as follows :-

  


  ffmpeg -i after_building_ffmpeg.mp4
ffmpeg version N-103222-gf040c1ec4e Copyright (c) 2000-2021 the FFmpeg developers
  built with gcc 7 (Ubuntu 7.5.0-3ubuntu1~18.04)
  configuration: --enable-gpl --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-librtmp --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-nonfree --enable-version3 --enable-libxcb
  libavutil      57.  3.100 / 57.  3.100
  libavcodec     59.  4.101 / 59.  4.101
  libavformat    59.  4.101 / 59.  4.101
  libavdevice    59.  0.100 / 59.  0.100
  libavfilter     8.  1.103 /  8.  1.103
  libswscale      6.  0.100 /  6.  0.100
  libswresample   4.  0.100 /  4.  0.100
  libpostproc    56.  0.100 / 56.  0.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'after_building_ffmpeg.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf59.4.101
  Duration: 00:00:03.00, start: 0.000000, bitrate: 5893 kb/s
  Stream #0:0(und): Video: h264 (High 10) (avc1 / 0x31637661), yuv420p10le(tv, gbr/unknown/unknown), 1400x1400 [SAR 1:1 DAR 1:1], 5888 kb/s, 25 fps, 25 tbr, 12800 tbn (default)
    Metadata:
      handler_name    : VideoHandler
      vendor_id       : [0][0][0][0]


  


• FFMPEG wrapping live h264 to mp4 container delay

  3 août 2021, par Emil Borconi

  Sorry if this has been asked but I couldn't find the answer.

  


  I'm trying to wrap a live raw h264 stream to a fragmented MP4 container. This is working as expected, with one issue, I have a 5-10 seconds delay between the input and output. Basically the output start after 5-10 seconds of the first input received.

  


  This is my command :

  


  ffmpeg -r 30 -f h264 -i tcp://127.0.0.1:1234 -c:v copy -an -f mp4 -movflags separate_moof+empty_moov+default_base_moof -tune zerolatency -tcp_nodelay true -frag_duration 33000 -max_muxing_queue_size 1 tcp://127.0.0.1:1235


  


  I have played with fflags, with analyzeduration and with everything I could find in the documentation but no joy.

  


  The input stream is receiving NALU units and I can see that it receives a significant amount of units before it actually starts outputting. Once it starts it works perfect, but the output video is always 5-10 seconds behind the input one.

  


  After a bunch of NALU units received I see ffmpeg outputting the following :

  


  2021-08-02 23:46:22.071 24626-11173/app.example.com I/ffmpeg-kit: Input #0, h264, from 'tcp://127.0.0.1:8105':
2021-08-02 23:46:22.071 24626-11173/app.example.com I/ffmpeg-kit:   Duration: 
2021-08-02 23:46:22.071 24626-11173/app.example.com I/ffmpeg-kit: N/A
2021-08-02 23:46:22.071 24626-11173/app.example.com I/ffmpeg-kit: , bitrate: 
2021-08-02 23:46:22.071 24626-11173/app.example.com I/ffmpeg-kit: N/A
2021-08-02 23:46:22.071 24626-11173/app.example.com I/ffmpeg-kit:   Stream #0:0
2021-08-02 23:46:22.071 24626-11173/app.example.com I/ffmpeg-kit: : Video: h264, yuv420p(tv, smpte170m/bt470bg/smpte170m, progressive), 1280x720
2021-08-02 23:46:22.071 24626-11173/app.example.com I/ffmpeg-kit: , 
2021-08-02 23:46:22.072 24626-11173/app.example.com I/ffmpeg-kit: 30 fps, 
2021-08-02 23:46:22.072 24626-11173/app.example.com I/ffmpeg-kit: 30 tbr, 
2021-08-02 23:46:22.072 24626-11173/app.example.com I/ffmpeg-kit: 1200k tbn, 
2021-08-02 23:46:22.072 24626-11173/app.example.com I/ffmpeg-kit: 60 tbc
2021-08-02 23:46:22.079 24626-11173/app.example.com I/ffmpeg-kit: Output #0, mp4, to 'tcp://127.0.0.1:8104':
2021-08-02 23:46:22.079 24626-11173/app.example.com I/ffmpeg-kit:   Metadata:
2021-08-02 23:46:22.079 24626-11173/app.example.com I/ffmpeg-kit:     encoder         : 
2021-08-02 23:46:22.079 24626-11173/app.example.com I/ffmpeg-kit: Lavf58.67.100
2021-08-02 23:46:22.079 24626-11173/app.example.com I/ffmpeg-kit:   Stream #0:0
2021-08-02 23:46:22.079 24626-11173/app.example.com I/ffmpeg-kit: : Video: h264 (avc1 / 0x31637661), yuv420p(tv, smpte170m/bt470bg/smpte170m, progressive), 1280x720, q=2-31
2021-08-02 23:46:22.080 24626-11173/app.example.com I/ffmpeg-kit: , 
2021-08-02 23:46:22.080 24626-11173/app.example.com I/ffmpeg-kit: 30 fps, 
2021-08-02 23:46:22.080 24626-11173/app.example.com I/ffmpeg-kit: 30 tbr, 
2021-08-02 23:46:22.080 24626-11173/app.example.com I/ffmpeg-kit: 15360 tbn, 
2021-08-02 23:46:22.080 24626-11173/app.example.com I/ffmpeg-kit: 30 tbc
2021-08-02 23:46:22.080 24626-11173/app.example.com I/ffmpeg-kit: Stream mapping:
2021-08-02 23:46:22.080 24626-11173/app.example.com I/ffmpeg-kit:   Stream #0:0 -> #0:0
2021-08-02 23:46:22.080 24626-11173/app.example.com I/ffmpeg-kit:  (copy)
2021-08-02 23:46:22.080 24626-11173/app.example.com I/ffmpeg-kit: Press [q] to stop, [?] for help


  


  That is an Android wrapper, but same thing happen if I run the command on my laptop from the command line.

  


  What am I'm missing, I need this to be real-time / instant muxing...

  


  Thanks for the help.

  


• Problem in playing fragmented MP4 that create with FFMPEG

  18 août 2021, par Micle

  For creating fragmented MP4 video file, I'm using FFMPEG AVCodec library(Accord VideoWriter) and set movflags with value frag_keyframe+empty_moov based on How to output fragmented mp4 with ffmpeg ?

  


   av_dict_set(&videoOptions, "movflags", "frag_keyframe+empty_moov", 0);
 avformat_write_header(oc, &videoOptions);


  


  Sample output video

  


  As you see, video is not played while all of video frames downloaded completely.
  
I tried to set moov_size , frag_duration and min_frag_duration flags for correction, but doesn't change anything.

  


  Result of all my test :