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• audio/mp4 ; codecs="mp4a.40.2" not playing in Chrome and Firefox

  19 octobre 2020, par Stefan Falk

  It seems I want to convert audios, which I want to stream on my website, to audio/mp4; codecs="mp4a.40.2".

  


  Using ffmpeg-cli-wrapper, I am converting my uploaded audio files with this command here :

  


  ffmpeg -i /tmp/input.any -acodec aac -b:a 256000 /tmp/output.aac


  


  On the client I am creating a SourceBuffer like this :

  


  this.sourceBuffer = this.mediaSource.addSourceBuffer('audio/mp4; codecs="mp4a.40.2"');


  


  The errors are :

  


  Chrome :

  


  NotSupportedError: Failed to load because no supported source was found.


  


  Firefox :

  


  NotSupportedError: The media resource indicated by the src attribute or assigned media provider object was not suitable.


  


  Here comes the fun part :

  


  If I create the SourceBuffer using audio/aac as mime-type :

  


  this.sourceBuffer = this.mediaSource.addSourceBuffer('audio/aac');


  


  the audio gets played correctly on Chrome but Firefox says :

  


  MediaSource.addSourceBuffer: Type not supported in MediaSource


  


  ---

  


  Update

  


  After changing the command to

  


  ffmpeg -i /tmp/input.any -acodec aac -b:a 256000 /tmp/output.mp4
                                                             ^^^ 


  


  Chrome/Firefox do not give an error when using audio/mp4; codecs="mp4a.40.2", but the audio is not being played.

  


  ---

  


  See

  


  

  • https://stackoverflow.com/a/64432478/826983

  


  


• ffmpeg errors out with Error initializing output stream 0:0 for the setting `-profile:v main`

  17 octobre 2020, par Vishwasa Navada K

  We are using ffmpeg for generating HSL streaming files (.m3u8, .ts) from multiple type of input video and audio like avi, mp4, mp3, mkv, m4a etc. We are trying to encode everything into h264 streams to support modern browsers. But we are facing issues in converting few videos of type avi and mp4 (not all). Below is the ffmpeg command (it's using ffmpeg fluent on NodeJS).

  


  ffmpeg(fileName)
  .outputOptions([
    '-c:v h264',
    '-profile:v main',
    `-vf scale=1280:-2`,
    '-hls_list_size 0',
    '-start_number 0',
    '-hls_time 10',
    '-loglevel error',
  ])
  .output(output_file_path)


  


  When we try to run this with some set of specific avi and mp4 samples, it errors out saying
Error: ffmpeg exited with code 1: Error initializing output stream 0:0 -- Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height.

  


  I tried changing few commands (like providing crf value) and tried to run them, The only time it successfully converted converted them was when I removed the output option -profile:v main. I am not sure about the reason behind it.

  


  I ran ffprobe to get the information from the videos that were not able to generate streams. I have them uploaded to gist here : https://gist.github.com/vishwasnavadak/91b5c978e2a3cb7a7c7a2bb505487263

  


  Is there something I am missing ? What is the reason for it to error out when -profile:v main option is present ?

  


• VP9 Profile 2 VDPAU support

  8 octobre 2020, par ManojGuptaBonda

  VP9 Profile 2 VDPAU support
  Added VDPAU to list of supported formats for VP9 420 10 and 12 bit
  
  formats. Add VP9 10/12 Bit support for VDPAU
  Signed-off-by : Philip Langdale <philipl@overt.org>
  

  • [DH] Changelog
  • [DH] libavcodec/version.h
  • [DH] libavcodec/vp9.c