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• ffmpeg : Combine/merge multiple mp4 videos not working, output only contains the first video

  17 août 2021, par dtbaker

  Here is the command I am using to combine multiple videos :

  



  ffmpeg -i 75_540_38HQ2.mp4 -i 76_70_20.mp4 -i 76_173_80.mp4 -i 81_186_35.mp4 -vcodec copy -acodec copy Mux1.mp4

  



  The resulting Mux1.mp4 does not contain all videos. Only the first video (75_540_38HQ2.mp4). The file size of the source and resulting video is below (as you can see, resulting video is slightly larger than first vid) :

  



  
$ ls -lh
-rw-r—r— 1 dbaker dbaker  42M 2011-03-24 11:59 75_540_38HQ2.mp4
-rw-r—r— 1 dbaker dbaker 236M 2011-03-24 12:09 76_173_80.mp4
-rw-r—r— 1 dbaker dbaker  26M 2011-03-24 12:05 76_70_20.mp4
-rw-r—r— 1 dbaker dbaker  54M 2011-03-24 12:15 81_186_35.mp4
-rw-r—r— 1 dbaker dbaker  44M 2011-03-24 14:48 Mux1.mp4


  



  Here is the output of the ffmpeg command. To me it looks ok, showing the multiple source inputs and the single output.

  



  
FFmpeg version SVN-r26402, Copyright (c) 2000-2011 the FFmpeg developers
  built on Mar 21 2011 18:05:32 with gcc 4.4.5
  configuration : —enable-gpl —enable-version3 —enable-nonfree —enable-postproc —enable-libfaac —enable-libmp3lame —enable-libopencore-amrnb —enable-libopencore-amrwb —enable-libtheora —enable-libvorbis —enable-libvpx —enable-libx264 —enable-libxvid —enable-x11grab
  libavutil     50.36. 0 / 50.36. 0
  libavcore      0.16. 1 /  0.16. 1
  libavcodec    52.108. 0 / 52.108. 0
  libavformat   52.93. 0 / 52.93. 0
  libavdevice   52. 2. 3 / 52. 2. 3
  libavfilter    1.74. 0 /  1.74. 0
  libswscale     0.12. 0 /  0.12. 0
  libpostproc   51. 2. 0 / 51. 2. 0
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '75_540_38HQ2.mp4' :
  Metadata :
    major_brand : isom
    minor_version : 512
    compatible_brands : isomiso2avc1mp41
    creation_time : 1970-01-01 00:00:00
    encoder : Lavf52.93.0
  Duration : 00:00:29.99, start : 0.000000, bitrate : 11517 kb/s
    Stream #0.0(eng) : Video : h264, yuv420p, 1280x960 [PAR 1:1 DAR 4:3], 11575 kb/s, 29.94 fps, 29.97 tbr, 30k tbn, 59.94 tbc
    Metadata :
      creation_time : 1970-01-01 00:00:00
    Stream #0.1(eng) : Audio : aac, 48000 Hz, stereo, s16, 127 kb/s
    Metadata :
      creation_time : 1970-01-01 00:00:00
Input #1, mov,mp4,m4a,3gp,3g2,mj2, from '76_70_20.mp4' :
  Metadata :
    major_brand : isom
    minor_version : 512
    compatible_brands : isomiso2avc1mp41
    creation_time : 1970-01-01 00:00:00
    encoder : Lavf52.93.0
  Duration : 00:00:19.98, start : 0.000000, bitrate : 10901 kb/s
    Stream #1.0(eng) : Video : h264, yuv420p, 1280x960 [PAR 1:1 DAR 4:3], 10804 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc
    Metadata :
      creation_time : 1970-01-01 00:00:00
    Stream #1.1(eng) : Audio : aac, 48000 Hz, stereo, s16, 128 kb/s
    Metadata :
      creation_time : 1970-01-01 00:00:00
Input #2, mov,mp4,m4a,3gp,3g2,mj2, from '76_173_80.mp4' :
  Metadata :
    major_brand : isom
    minor_version : 512
    compatible_brands : isomiso2avc1mp41
    creation_time : 1970-01-01 00:00:00
    encoder : Lavf52.93.0
  Duration : 00:03:09.99, start : 0.000000, bitrate : 10393 kb/s
    Stream #2.0(eng) : Video : h264, yuv420p, 1280x960 [PAR 1:1 DAR 4:3], 10321 kb/s, 29.96 fps, 29.97 tbr, 30k tbn, 59.94 tbc
    Metadata :
      creation_time : 1970-01-01 00:00:00
    Stream #2.1(eng) : Audio : aac, 48000 Hz, stereo, s16, 128 kb/s
    Metadata :
      creation_time : 1970-01-01 00:00:00

Seems stream 0 codec frame rate differs from container frame rate : 119.88 (120000/1001) -> 30000.00 (30000/1)
Input #3, mov,mp4,m4a,3gp,3g2,mj2, from '81_186_35.mp4' :
  Metadata :
    major_brand : isom
    minor_version : 512
    compatible_brands : isomiso2avc1mp41
    creation_time : 1970-01-01 00:00:00
    encoder : Lavf52.93.0
  Duration : 00:00:35.00, start : 0.000000, bitrate : 12700 kb/s
    Stream #3.0(eng) : Video : h264, yuv420p, 1280x720 [PAR 1:1 DAR 16:9], 12620 kb/s, 59.91 fps, 30k tbr, 60k tbn, 119.88 tbc
    Metadata :
      creation_time : 1970-01-01 00:00:00
    Stream #3.1(eng) : Audio : aac, 48000 Hz, stereo, s16, 128 kb/s
    Metadata :
      creation_time : 1970-01-01 00:00:00
Output #0, mp4, to 'Mux1.mp4' :
  Metadata :
    major_brand : isom
    minor_version : 512
    compatible_brands : isomiso2avc1mp41
    creation_time : 1970-01-01 00:00:00
    encoder : Lavf52.93.0
    Stream #0.0(eng) : Video : libx264, yuv420p, 1280x960 [PAR 1:1 DAR 4:3], q=2-31, 11575 kb/s, 30k tbn, 29.97 tbc
    Metadata :
      creation_time : 1970-01-01 00:00:00
    Stream #0.1(eng) : Audio : libfaac, 48000 Hz, stereo, 128 kb/s
    Metadata :
      creation_time : 1970-01-01 00:00:00
Stream mapping :
  Stream #0.0 -> #0.0
  Stream #2.1 -> #0.1
Press [q] to stop encoding
frame=  883 fps=632 q=-1.0 Lsize=   44730kB time=29.40 bitrate=12465.1kbits/s    
video:41678kB audio:2969kB global headers:0kB muxing overhead 0.184548%


  



  Am I doing something blindingly stupid here ?

  



  The source videos came from a video camera, and are small snippets taken with ffmpeg -i bigfile.mp4 -ss 20 -t 10 -vcodec copy etc..

  



  Thanks heaps !!
Dave

  



  ---

  



  Edit : couldn't solve it so I just use avidemux GUI tool. It seemed to append the MP4's just fine.

  



  Must be a problem with MP4's or just the ones that come off a gopro camera.

  


• mpegts proxy allowing multiple concurrent views of same source feed

  5 juillet 2018, par Yass T

  I am having trouble finding a (preferably non-commercial) linux compatible project that would allow to "restream" one particular MPEGTS live source feed to multiple clients, without requesting it more than once from the source.

  Imagine an mpegts live source feed coming from http://my_mpegts_provider (imagine we have the direct link, no m3u style playlist), I would like a program to be able to grab that source and proxy it to one AND more client devices (let’s say VLC players) when they are requesting it, even if not requested at the same time.

  In other words, can we proxy the MPEGTS stream so only our proxy will be seen as the "client" (from the source provider point of view) when multiple devices (on the same network) connect to the SAME source on this side ?

  I tried the node-ffmpeg-mpegts-proxy but it clearly showed two separate connections to the source when asking for the same "channel" with two different VLC clients (confirmed with netstat).

  Thanks, and sorry in advance if my post is out of stackoverflow rules, I can’t think of a better place to gather some good opinions

• Using ffmpeg to join segments from multiple videos

  5 juillet 2018, par user2171832

  We are trying to set up a process to let a user join together segments from multiple videos. Our process is set up to use ffmpeg to make separate mp4 files for each segment and to then to join them using the ffmpeg concat demuxer process. In generating the segment mp4 files, we are trying to make them all the same in terms of codex, dimensions, etc. so the concatenation will be successful. Here’s an example of the call to create one of the segment mp4s.

  ffmpeg -ss 0.5 -t 299.5 -i /tmp/vid1.mp4 -c:v libx264 -c:a aac -framerate 29.97 -b:v 540k -maxrate 540k -minrate 540k -bufsize 540k -vf scale=640:480,fade=t=out:st=294.5:d=5 /tmp/vid1_new.mp4

  This process works in some cases, but in others the joined file will play the first segment properly, but the later segments the video will sometimes freeze, or the audio will get speeded up. Does anyone have any suggestions for how to make the above ffmpeg command more "bullet-proof" so all the files will be compatible ?

  ---

  The command we use to concatenate files is :

  /var/ffmpg/bin/ffmpeg -f concat -safe 0 -i /tmp/files.txt -c copy /tmp/combined.mp4

  The ffprobe output for one file is :

  {
  
    "format": {
  
      "filename": "vid2.mp4",
  
      "nb_streams": 2,
  
      "nb_programs": 0,
  
      "format_name": "mov,mp4,m4a,3gp,3g2,mj2",
  
      "format_long_name": "QuickTime / MOV",
  
      "start_time": "0.000000",
  
      "duration": "1004.944000",
  
      "size": "109489681",
  
      "bit_rate": "871608",
  
      "probe_score": 100,
  
      "tags": {
  
        "major_brand": "isom",
  
        "minor_version": "512",
  
        "compatible_brands": "isomiso2avc1mp41",
  
        "encoder": "Lavf54.63.103"
  
      }
  
    }
  
  }

  The ffprobe output of the second file :

  {
  
    "format": {
  
      "filename": "vid1.mp4",
  
      "nb_streams": 2,
  
      "nb_programs": 0,
  
      "format_name": "mov,mp4,m4a,3gp,3g2,mj2",
  
      "format_long_name": "QuickTime / MOV",
  
      "start_time": "0.000000",
  
      "duration": "1159.164000",
  
      "size": "63903454",
  
      "bit_rate": "441031",
  
      "probe_score": 100,
  
      "tags": {
  
        "major_brand": "isom",
  
        "minor_version": "512",
  
        "compatible_brands": "isomiso2avc1mp41",
  
        "encoder": "Lavf56.40.100"
  
      }
  
    }
  
  }