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• How to properly abort av_seek_frame on FFmpeg ?

  5 mars 2021, par SuRGeoNix

  Normally, you wouldn't care aborting av_seek_frame as it would be really fast on a local file. However, in my case I use a custom AVIOContext for torrent streaming with custom read/seek functions and I'm not able to abort a single seek request !

  


  I've already tried interrupt callbacks (they will not be called at all), some timeouts (rw_timeout/timeout etc.) but by checking FFmpeg's code didn't find anything at all. My last chance was to try to return on read/seek functions an error (I've tried AVERROR_EXIT) which causes even more problems (memory leaks).

  


  The main issue is with Matroska formats that they need to resync (level-1) and they are trying to scan the whole file.

  


  Unfortunately, I'm using C# .NET with FFmpeg.Autogen bindings which means that I don't have low-level access to play around. My workaround is to re-open the whole format context in case on seek abort (to ensure that the player will continues to play at least)

  


  Hope you have a tip for me !

  


  (By the way for some http/hls web formats interrupt callbacks are supported)

  


• Have 2 blocking scripts interact with each other in linux

  18 novembre 2014, par Ortixx

  I have 2 blocking shell scripts which I want to have interact with each other. The scripts in question are peerflix (nodejs script) and ffmpeg (a simple bash script).

  What happens : Peerflix fires up, feeds data to ffmpeg bash scrip which terminates peerflix on completion.

  So once peerflix starts it outputs 2 lines and blocks immediately :

  [08:15 PM]-[vagrant@packer-virtualbox-iso]-[/var/www/test]-[git master] 
  
  $ node /var/www/test/node/node_modules/peerflix/app.js /var/www/test/flexget/torrents/test.torrent -r -q
  
  listening: http://10.0.2.15:38339/
  
  process: 9601

  I have to feed the listening address to the ffmpeg bash script :

  #!/bin/sh
  
  ffmpeg -ss 00:05:00 -i {THE_LISTENING_PORT} -frames:v 1 out1.jpg
  
  ffmpeg -ss 00:10:00 -i {THE_LISTENING_PORT} -frames:v 1 out2.jpg

  After the bash script is done I have to kill the peerflix script (hence me outputting the PID).

  My question is how do I achieve this ?

• FFmpeg mosaic video creation, Why it doesn't work ?

  3 mai 2019, par Ege Darçın

  I am trying to build a mosaic from multiple videos in an android application using FFmpeg, I have found the wiki on how to do it. The link explains the process well but I am getting this error while processing it :

  I/Videokit : start run in main.

  register_exit

  term_init & parse options.

  D/Videokit : ERROR OCCURED

  The library that I’m using is WritingMinds, which is FFmpeg for Android compiled with x264, libass, fontconfig, freetype, fribidi and lame (Supports Android 4.1+). Basically, you write a string array of code which is passed to FFmpeg and it runs FFmpeg for you.

  Clearly, it is a parsing error but I believe that I have put the command in order. I have tested the files, locations and FFmpeg with other commands like trim, mute audio etc and only mosaic doesn’t work. I have tried different options, string manipulations but that didn’t work, Furthermore, I’ve seen OpenGl error if I put a big typo error.
  Here is the code on the wiki :

      -i 1.avi -i 2.avi -i 3.avi -i 4.avi
  
      -filter_complex "
  
          nullsrc=size=640x480 [base];
  
          [0:v] setpts=PTS-STARTPTS, scale=320x240 [upperleft];
  
          [1:v] setpts=PTS-STARTPTS, scale=320x240 [upperright];
  
          [2:v] setpts=PTS-STARTPTS, scale=320x240 [lowerleft];
  
          [3:v] setpts=PTS-STARTPTS, scale=320x240 [lowerright];
  
          [base][upperleft] overlay=shortest=1 [tmp1];
  
          [tmp1][upperright] overlay=shortest=1:x=320 [tmp2];
  
          [tmp2][lowerleft] overlay=shortest=1:y=240 [tmp3];
  
          [tmp3][lowerright] overlay=shortest=1:x=320:y=240
  
      "
  
      -c:v libx264 output.mkv

  This is the code which is on the wiki

  String[] m =new String[]{"-i",
  
                  DestPath1.toString(),
  
                  "-i",
  
                  DestPath2.toString(),
  
                  "-i",
  
                  DestPath3.toString(),
  
                  "-i",
  
                  DestPath4.toString(),
  
                  "-filter_complex",
  
                  "\"",
  
                  "nullsrc=size=640x480 [base];",
  
                  "[0:v] setpts=PTS-STARTPTS, scale=320x240 [upperleft];",
  
                  "[1:v] setpts=PTS-STARTPTS, scale=320x240 [upperright];",
  
                  "[2:v] setpts=PTS-STARTPTS, scale=320x240 [lowerleft];",
  
                  "[3:v] setpts=PTS-STARTPTS, scale=320x240 [lowerright];",
  
                  "[base][upperleft], overlay=shortest=1", "[tmp1];",
  
                  "[tmp1][upperright] overlay=shortest=1:x=320 [tmp2];",
  
                  "[tmp2][lowerleft] overlay=shortest=1:y=240 [tmp3];",
  
                  "[tmp3][lowerright] overlay=shortest=1:x=320:y=240",
  
                  "\"",
  
                  " -c:v",
  
                  "libx264",
  
                  FinalPath.toString()};
  
                  execFFmpegBinary(m);

  This is the string that I send to the FFmpeg.

  The expected result would be a video created on the "FinalPath" which is on the external storage. However, I am getting an error message and nothing else. I have a tight deadline so it would be hard for me to switch to another system and learn it, I’m already new to FFmpeg stuff. Any suggestions ?

  Update : I’ve implemented error handlers of the library, not just FFmpeg part, and it points reports as (’"nullsrc’ is not a filter) . However, I need to put (") into there to run the code and I use it as (\"), which does not solve the problem. Removing them is not an option because the statement after the filter needs the quotation marks.

  Update2 : Here is the current log :

  D/FileLog: Started command : ffmpeg [Ljava.lang.String;@7931693
  
      FAILED with output : ffmpeg version n3.0.1 Copyright (c) 2000-2016 the FFmpeg developers
  
        built with gcc 4.8 (GCC)
  
        configuration: --target-os=linux --cross-prefix=/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/bin/arm-linux-androideabi- --arch=arm --cpu=cortex-a8 --enable-runtime-cpudetect --sysroot=/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/sysroot --enable-pic --enable-libx264 --enable-libass --enable-libfreetype --enable-libfribidi --enable-libmp3lame --enable-fontconfig --enable-pthreads --disable-debug --disable-ffserver --enable-version3 --enable-hardcoded-tables --disable-ffplay --disable-ffprobe --enable-gpl --enable-yasm --disable-doc --disable-shared --enable-static --pkg-config=/home/vagrant/SourceCode/ffmpeg-android/ffmpeg-pkg-config --prefix=/home/vagrant/SourceCode/ffmpeg-android/build/armeabi-v7a --extra-cflags='-I/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/include -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fno-strict-overflow -fstack-protector-all' --extra-ldflags='-L/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/lib -Wl,-z,relro -Wl,-z,now -pie' --extra-libs='-lpng -lexpat -lm' --extra-cxxflags=
  
        libavutil      55. 17.103 / 55. 17.103
  
        libavcodec     57. 24.102 / 57. 24.102
  
        libavformat    57. 25.100 / 57. 25.100
  
        libavdevice    57.  0.101 / 57.  0.101
  
        libavfilter     6. 31.100 /  6. 31.100
  
        libswscale      4.  0.100 /  4.  0.100
  
        libswresample   2.  0.101 /  2.  0.101
  
        libpostproc    54.  0.100 / 54.  0.100
  
      Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/storage/emulated/0/Pictures/appName/Vid1.mp4':
  
        Metadata:
  
          major_brand     : isom
  
          minor_version   : 512
  
          compatible_brands: isomiso2avc1mp41
  
          encoder         : Lavf56.25.101
  
        Duration: 00:00:45.05, start: 0.033333, bitrate: 694 kb/s
  
          Stream #0:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 460x258 [SAR 1:1 DAR 230:129], 562 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
  
          Metadata:
  
            handler_name    : VideoHandler
  
          Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)
  
          Metadata:
  
            handler_name    : SoundHandler
  
      Input #1, mov,mp4,m4a,3gp,3g2,mj2, from '/storage/emulated/0/Pictures/appName/Vid2.mp4':
  
        Metadata:
  
          major_brand     : mp42
  
          minor_version   : 0
  
          compatible_brands: isommp42
  
          creation_time   : 2017-01-15 09:57:32
  
        Duration: 00:00:40.82, start: 0.000000, bitrate: 352 kb/s
  
          Stream #1:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p(tv, bt709), 360x360 [SAR 1:1 DAR 1:1], 253 kb/s, 28.90 fps, 29 tbr, 29 tbn, 58 tbc (default)
  
          Metadata:
  
            handler_name    : VideoHandler
  
          Stream #1:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 95 kb/s (default)
  
          Metadata:
  
            creation_time   : 2017-01-15 09:57:32
  
            handler_name    : IsoMedia File Produced by Google, 5-11-2011
  
      Input #2, mov,mp4,m4a,3gp,3g2,mj2, from '/storage/emulated/0/Pictures/appName/Vid3.mp4':
  
        Metadata:
  
          major_brand     : mp42
  
          minor_version   : 1
  
          compatible_brands: mp41mp42isom
  
          creation_time   : 2017-12-15 12:10:56
  
        Duration: 00:00:47.26, start: 0.000000, bitrate: 775 kb/s
  
          Stream #2:0(und): Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p(tv, smpte170m/smpte170m/bt709), 480x480, 706 kb/s, 26.98 fps, 27 tbr, 600 tbn, 1200 tbc (default)
  
          Metadata:
  
            creation_time   : 2017-12-15 12:10:56
  
            handler_name    : Core Media Video
  
          Stream #2:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 65 kb/s (default)
  
          Metadata:
  
            creation_time   : 2017-12-15 12:10:56
  
            handler_name    : Core Media Audio
  
      Input #3, mov,mp4,m4a,3gp,3g2,mj2, from '/storage/emulated/0/Pictures/appName/Vid4.mp4':
  
        Metadata:
  
          major_brand     : mp42
  
          minor_version   : 19529854
  
          compatible_brands: mp42isom
  
          creation_time   : 2017-12-17 10:05:07
  
        Duration: 00:00:14.33, start: 0.000000, bitrate: 803 kb/s
  
          Stream #3:0(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 96 k
  
  D/FileLog: Finished command : ffmpeg [Ljava.lang.String;@7931693
  
  V/FA: Inactivity, disconnecting from the service