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• ffmpeg - avcodec_decode_audio3 always returns 0 with aac decoding on android

  26 novembre 2011, par Android007

  I am writing an audio decoder based on ffmpeg for android, where I have to decode aac audio, but because of some reason it always returns 0 bytes decoded.

  Looks like I pass everything right. Can anybody tell me what went wrong in my case.I copied code from ffplay.c.
  What is the reason avcodec_decode_audio3 function always returns zero ?

  Here is the code from ffplay.c :

  AVPacket *pkt_temp = &is->audio_pkt_temp;
  
      AVPacket *pkt = &is->audio_pkt;
  
      AVCodecContext *dec= is->audio_st->codec;
  
      int n, len1, data_size;
  
      double pts;
  
  
  
            data_size = sizeof(is->audio_buf1);
  
          len1 = avcodec_decode_audio3(dec, (int16_t *)is->audio_buf1, &data_size, pkt_temp);
  
          if (len1 < 0) {
  
              pkt_temp->size = 0;
  
              break;
  
          } 
  
  
  
         if (data_size <= 0){
  
                     //This block always gets executed.
  
              continue;
  
      }

• How to add #EXT-X-PART:DURATION=0.200,URI="filePart271.0.mp4" into .m3u8 in ffmpeg ? [closed]

  11 août 2023, par palak

  So my question is : How do I add #EXT-X-PART:DURATION=0.200,URI="filePart271.0.mp4" to my HLS m3u8 playlist file using FFmpeg ?

  


  And the error i am receiving is Unrecognized option 'hls_part_flags'.
Error splitting the argument list : Option not found.

  


  as well as Unrecognized option 'hls_part_target'.
Error splitting the argument list : Option not found.

  


  Currently my FFmpeg command is the following :
ffmpeg -f lavfi -t 16 -i anullsrc -f lavfi -i testsrc=size=1280x720:rate=30 -c:v libx264 -c:a aac -t 16 -hls_time 4 -hls_playlist_type vod -hls_segment_type fmp4 -start_number 266 -hls_flags single_file -master_pl_name master.m3u8 -var_stream_map "v:0,a:0" -hls_segment_filename 'fileSequence%v.mp4' -hls_fmp4_init_filename 'city.mp4' -hls_base_url './' -hls_segment_filename 'filePart%v.%04d.mp4' -hls_part_flags '+independent' -hls_part_target 0.200 output.m3u8

  


  My expectation is that, How do I add #EXT-X-PART:DURATION=0.200,URI="filePart271.0.mp4" to my HLS m3u8 playlist file using FFmpeg ?

  


• Batch script for creating QCTools reports

  26 décembre 2019, par avfool

  I’m new here and new to bash scripting and have been having trouble with a script to do batch QCTools reports using ffprobe. Hoping someone can tell me what I’m getting wrong.

  I’ve been using ffmpovisr for help with creating scripts for transcoding folders full of video files. I’ve been successful with this and now would really like to generate QCTools reports for all the video files in a folder as well.

  I’m starting with this command line, which I use to run transcodes :

  for file in *.mov ; do ffmpeg -i "$file" -map 0 -dn -c:v ffv1 -level 3 -g 1 -slicecrc 1 -slices 16 -c:a copy "$file%.mov.mkv" ; done

  I’m trying to modify it to include the QCTools report command line which is :

  ffprobe -f lavfi -i "movie=input_file:s=v+a[in0][in1], [in0]signalstats=stat=tout+vrep+brng, cropdetect=reset=1:round=1, idet=half_life=1, split[a][b] ;[a]field=top[a1] ;[b]field=bottom, split[b1][b2] ;[a1][b1]psnr[c1] ;[c1][b2]ssim[out0] ;[in1]ebur128=metadata=1, astats=metadata=1:reset=1:length=0.4[out1]" -show_frames -show_versions -of xml=x=1:q=1 -noprivate | gzip > input_file.qctools.xml.gz

  What I’ve ended up with looks like this :

  for file in *.mov ; do ffprobe -f lavfi -i "movie="$file":s=v+a[in0][in1], [in0]signalstats=stat=tout+vrep+brng, cropdetect=reset=1:round=1, idet=half_life=1, split[a][b] ;[a]field=top[a1] ;[b]field=bottom, split[b1][b2] ;[a1][b1]psnr[c1] ;[c1][b2]ssim[out0] ;[in1]ebur128=metadata=1, astats=metadata=1:reset=1:length=0.4[out1]" -show_frames -show_versions -of xml=x=1:q=1 -noprivate | gzip > “$file%.mov.qctools.xml.gz” ; done

  I’ve messed around with various parts of this to try to get it to work and I just can’t figure out where the problem is. Any suggestions would be greatly appreciated !