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• How to concatenate two MP4 files using FFmpeg ? [closed]

  14 septembre 2024, par Mark L

  I'm trying to concatenate two mp4 files using ffmpeg. I need this to be an automatic process hence why I chose ffmpeg. I'm converting the two files into .ts files and then concatenating them and then trying to encode that concatenated .ts file. The files are h264 and aac encoded and I'm hoping to keep the quality the same or as close to original as possible.

  


  ffmpeg -i part1.mp4 -vcodec copy -vbsf h264_mp4toannexb -acodec copy part1.ts
ffmpeg -i part2.mp4 -vcodec copy -vbsf h264_mp4toannexb -acodec copy part2.ts
cat part1.ts part2.ts > parts.ts
ffmpeg -y -i parts.ts -acodec copy -ar 44100 -ab 96k -coder ac -vbsf h264_mp4toannexb parts.mp4


  


  Unfortunately I'm getting the following error message coming back from ffmpeg during encoding :

  


  [h264 @ 0x1012600]sps_id out of range
[h264 @ 0x1012600]non-existing SPS 0 referenced in buffering period
[h264 @ 0x1012600]sps_id out of range
[h264 @ 0x1012600]non-existing SPS 0 referenced in buffering period
[NULL @ 0x101d600]error, non monotone timestamps 13779431 >= 13779431kbits/s    
av_interleaved_write_frame(): Error while opening file


  


  This happens about half way through encoding which makes me think that you can't concat two .ts files together and have it work.

  


• How does ffmpeg c/c++ concat mp4 files composed of unequal lengths of audio and video ?

  23 juin 2018, par fredirty2017
  • I am now write a program for capture microphone and desktop courses as mp4, where the microphone and screen image are captured independently, which means that it is possible that the microphone and screen are captured synchronously, and it is also possible that only the microphone are captured and screen are not capture, vice versa.
  • In addition, I will produce a piece of mp4 file according to the time, such as 10 minutes. Finally, once the entire lesson operation is completed, I will concat all the mp4 clip files into one big mp4 file.
  • I am not sure that mp4 has a way to set the last video frame or silent audio frame of the last clip file image for a period of time. Or do I have to fill these silent frames myself ?

• MPD MPEG-DASH - Shows only one bitrate

  13 août 2018, par Justin Rec

  Help. I wont show bitrate.
  player.getBitrateInfoListFor("video") ;
  Shows only one bitrate - 454948

  manifest.mpd generated by GPAC

   <period duration="PT0H21M48.338S">
  
    <adaptationset segmentalignment="true" group="1" maxwidth="270" maxheight="480" maxframerate="2070000/93437" par="270:480" lang="und">
  
     <representation mimetype="video/mp4" codecs="avc3.640015" width="270" height="480" framerate="2070000/93437" sar="1:1" startwithsap="1" bandwidth="454948">
  
      <segmenttemplate media="480_bbb/segment__track1_$Number$.m4s" timescale="2070000" startnumber="1" duration="8280000" initialization="480_bbb/segment__track1_init.mp4"></segmenttemplate>
  
     </representation>
  
    </adaptationset>
  
    <adaptationset segmentalignment="true" group="1" maxwidth="202" maxheight="360" maxframerate="2070000/93437" par="202:360" lang="und">
  
     <representation mimetype="video/mp4" codecs="avc3.64000D" width="202" height="360" framerate="2070000/93437" sar="1:1" startwithsap="1" bandwidth="281508">
  
      <segmenttemplate media="360_bbb/segment__track1_$Number$.m4s" timescale="2070000" startnumber="1" duration="8280000" initialization="360_bbb/segment__track1_init.mp4"></segmenttemplate>
  
     </representation>
  
    </adaptationset>
  
    <adaptationset segmentalignment="true" group="1" maxwidth="134" maxheight="240" maxframerate="2070000/93437" par="134:240" lang="und">
  
     <representation mimetype="video/mp4" codecs="avc3.64000B" width="134" height="240" framerate="2070000/93437" sar="1:1" startwithsap="1" bandwidth="182832">
  
      <segmenttemplate media="240_bbb/segment__track1_$Number$.m4s" timescale="2070000" startnumber="1" duration="8280000" initialization="240_bbb/segment__track1_init.mp4"></segmenttemplate>
  
     </representation>
  
    </adaptationset>
  
    <adaptationset segmentalignment="true" group="1" maxwidth="80" maxheight="144" maxframerate="2070000/93437" par="80:144" lang="und">
  
     <representation mimetype="video/mp4" codecs="avc3.640009" width="80" height="144" framerate="2070000/93437" sar="1:1" startwithsap="1" bandwidth="99667">
  
      <segmenttemplate media="144_bbb/segment__track1_$Number$.m4s" timescale="2070000" startnumber="1" duration="8280000" initialization="144_bbb/segment__track1_init.mp4"></segmenttemplate>
  
     </representation>
  
    </adaptationset>
  
    <adaptationset segmentalignment="true" lang="und">
  
     <representation mimetype="audio/mp4" codecs="mp4a.40.2" startwithsap="1" bandwidth="66056">
  
      <audiochannelconfiguration schemeiduri="urn:mpeg:dash:23003:3:audio_channel_configuration:2011" value="1"></audiochannelconfiguration>
  
      <segmenttemplate media="audio_bbb/segment__track2_$Number$.m4s" timescale="48000" startnumber="1" duration="192000" initialization="audio_bbb/segment__track2_init.mp4"></segmenttemplate>
  
     </representation>
  
    </adaptationset>
  
   </period>

  player.getBitrateInfoListFor("video") ;
  Shows only one bitrate - 454948