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• iOS/Safari MediaRecorder Extremely Big File sizes with FFMPEG Or issue with MediaRecorder

  13 janvier 2021, par Dean Van Greunen

  Having an issue where the output video size of the converted video is 0.

  


  however i believe that the issue is with the mediarecorder code :

  


  recorder = new MediaRecorder(this.stream, { mimeType: "video/webm;codecs=vp9" });
recorder.ondataavailable = async (e) => {
  const payload = e.data;
  let y = blob2base64(payload);
  // take y and transfer to server, (on server decode base64 string and append that to the video file)
}


  


  I have the MediaRecorder API Enabled via the safari and iOS settings.

  


  for example after processing and saving the data chunks for the video that has been captured. Weird is that the video is blank but when using ffprobe, all the info is correct. so i'm stuffed.

  


  Here is the Captured Video (Before conversion)

  


  after conversion, the new file is 0 bytes big

  


  Note :
this works fine on windows and linux.
issue is only with iOS or MacOS

  


  Not sure what i am doing long.

  


• Does Webm support cover art ?

  14 janvier 2021, par chrish

  I am converting MP3 to Webm and the MP3 file includes a video stream for the cover art.

  


  ffprobe filename.mp3
...
    Stream #0:0: Audio: mp3, 22050 Hz, stereo, fltp, 64 kb/s
    Stream #0:1: Video: mjpeg (Baseline), yuvj444p(pc, bt470bg/unknown/unknown), 300x300, 90k tbr, 90k tbn, 90k tbc (attached pic)


  


  Using ffmpeg with libopus codec to convert the file causes a VP9 video stream that doesn't work well. I noticed :

  


  

  1. VLC Player doesn't show the duration and the progress scrubber doesn't move when playing.

  


  2. Android Media Player doesn't show image for the cover art of the track.

  


  


  ffprobe filename.webm
...
Input #0, matroska,webm, from 'webm_bad/B01___01_Matthew_____ENGWEBN2DA.webm':
...
    Stream #0:0: Video: vp9 (Profile 1), yuv444p(tv, progressive), 300x300, SAR 1:1 DAR 1:1, 1k tbr, 1k tbn, 1k tbc (default)


  


  If I tried to use -vcodec copy option, then I get this error :

  


  [webm @ 0x7fdddf028e00] Only VP8 or VP9 or AV1 video and Vorbis or Opus audio and WebVTT subtitles are supported for WebM.
Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument
Error initializing output stream 0:1 --


  


  Does WebM support cover art ? If so, how do I transfer the MP3 cover art over using ffmpeg (or other tool) ?

  


• AVPlayer won't play audio files from FFMPEG

  18 janvier 2021, par Marcus

  Before requesting audio data AVPlayer requests byte range 0-1 from FFMPEG.

  


  FFMPEG gives a 200 response, but AVPlayer requires a 206 response.

  


  This results in the request failing and audio can't be played.

  


  Expected behavior :
Play tracks when streaming through ffmpeg

  


  Current behavior : When trying to stream with ffmpeg we get "Operation Stopped"

  


  Sample FFMPEG command :

  


  ffmpeg -i "/path/to/audio/track.mp3" -vn -strict -2 -acodec pcm_u8 -f wav -listen 1 -seekable 1 http://localhost:8090/restream.wav


  


  Player Log :

  


  Error Domain=AVFoundationErrorDomain Code=-11850 "Operation Stopped" UserInfo={NSLocalizedFailureReason=The server is not correctly configured., NSLocalizedDescription=Operation Stopped, NSUnderlyingError=0x600003bcc4b0 {Error Domain=NSOSStatusErrorDomain Code=-12939 "(null)"}}
!av_interleaved_write_frame(): Broken pipe

!Connection to tcp://localhost:8090 failed: Connection refused

!Connection to tcp://localhost:8090 failed: Connection refused

!Connection to tcp://localhost:8090 failed: Connection refused

!Error writing trailer of http://localhost:8090/restream.wav: Broken pipe


  


  This error is defined by Apple as :

  


  +"The HTTP server sending the media resource is not configured as expected. This might mean that the server does not support byte range requests."


  


  And summarised nicely in this StackOverflow post :

  


  when AVPlayerItem receive a video URL , it do the following task:

    Send a bytes request HTTP Request, and range = 0 -1
    If the response code is 206 and return 1 bytes data, It do the 3th task, if not, AVErrorServerIncorrectlyConfigured error occurred.
    continue send other HTTP Request, to download segment of All duration. and the response of VideoData code must be 206

In my situation , when send range[0-1] HTTP request, the server side give me a 200 OK response, So error occurred.


  


  Network Log :

  


  GET /file.wav HTTP/1.1
Host: localhost:1234
X-Playback-Session-Id: F72F1139-6F4C-4A22-B334-407672045A86
Range: bytes=0-1
Accept: */*
User-Agent: AppleCoreMedia/1.0.0.18C61 (iPhone; U; CPU OS 14_3 like Mac OS X; en_us)
Accept-Language: en-us
Accept-Encoding: identity
Connection: keep-alive

HTTP/1.1 200 OK
Content-Type: application/octet-stream
Transfer-Encoding: chunked


  


  Reproduce using this sample app :

  


  This can also be reproduced using standard ffmpeg and adding URL to local or remote ffmpeg URL

  


  Can we solve this by making changes to FFMPEG or AVPlayer ?