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• ffmpeg avcodec_open2 returns -22 if I change my speaker configuration

  5 octobre 2014, par pacificator

  I keep having a strange issue lately.
  Depending on how I set up my audio configuration in windows ( stereo/quad/5.1 ), a ffmpeg call to avcodec_open2() fails with error -22 or just works.
  Not being able to find much about that error, I thought I should ask about it here.
  The main flow goes like this :

  c = st->codec;
  
  avformat_alloc_output_context2(&oc, NULL, NULL, "video.mpeg");
  
  oc->fmt->audio_codec = AV_CODEC_ID_MP2;
  
  AVDictionary* dict = NULL;
  
  ret = av_dict_set(&dict, "ac", "2", 0);
  
  c->request_channels = 2;
  
  
  
  ret = avcodec_open2(c, codec, &dict); //HERE IT FAILS WITH -22 if speaker configuration  is not stereo

  The codec context ’c’ is set up like this in a stream :

  st = avformat_new_stream(oc, *codec);
  
  c = st->codec;
  
  c->channels     = 2;
  
  c->channel_layout = AV_CH_LAYOUT_STEREO;
  
  c->sample_fmt   = AV_SAMPLE_FMT_S16;
  
  c->codec_id     = codec_id;

  Most of it is copied from their one of the muxing examples found in the documentation.
  Everything works as expected if in windows I have set the output to stereo.

  If I set my speaker configuration to 5.1 ( 6 channels ), avcodec_open2 fails with error -22.

  So I have a hard time understanding what am I doing wrong. Normally it should not be any relationship between my speaker configuration and the result of avcodec_open2.

  Are there some other parameters that I need to set ?

• FFmpeg returns empty byte when retrieving frames with python

  13 août 2020, par Ronald Saunfe

  I am trying to retrieve frames from a video frame by frame using ffmpeg which i downloaded here but i get an empty response as byte :
i need someone to outline what my problem is.I got the solution from a blog here
Here is my source code :

  


  import subprocess as sp

command=['bin\\ffmpeg.exe',
'-i','%s'%self.source,
'-f','image2pipe',
'-pix_fmt','rgb24',
'-vcodex','rawvideo','-']

self.pipe = sp.Popen(command, stdout = sp.PIPE, bufsize = 10**8)
Raw_image = self.pipe.stdout.read(420*360*3)


  


• FFMPEG - Audio conversion from MP3 to M3u8 works for some songs, not for others. Look's like it's detecting video ?

  20 avril 2024, par Kyle Orius

  Problem : I need to convert MP3s (of unknown Origin) into M3u8 files so that I can HLS stream them.

  


  This command here works for a song called 'jesussaves.mp3'

  


  ffmpeg -i ../jesussaves.mp3 -c:a aac -b:a 192k -ac 2 -f hls -hls_time 10 -preset ultrafast -flags -global_header master.m3u8

  


  When I change it to use the song 'In my Darkest Hour' - (I've renamed the file to inmydh.mp3) - I only get one TS file output instead of multiple. The log is here : https://ibb.co/5nG0j01

  


  Thank you