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• x264 with multiple passes specify location of temporary file ?

  16 août 2012, par Richard Knop

  So, my situation is like this. I have three x264 commands with 3 passes I want to run in parallel :

  x264 -p 1 ...
  
  x264 -p 1 ...
  
  x264 -p 1 ...

  Then I want to run the second pass in parallel :

  x264 -p 2 ...
  
  x264 -p 2 ...
  
  x264 -p 2 ...

  And the third pass as well.

  The problem is, because I am running three x264 commands with -p option at the same time (using multiprocessing), they are all trying to use the same temporary files to save the results of the first/second pass.

  Is there a way to specify for each x264 command to use a different temporary file ?

• ffmpeg : Combine/merge multiple mp4 videos - not working

  9 juin 2016, 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.

• ffmpeg transcoding reset the start time of file

  12 août 2013, par diousk

  I use a segmenter to segment my MPEG 2 Ts file into a series of media segment for HTTP live streaming

  and each segment's start time following the previous one
  (ex:start time of segments : 00:00,00:10,00:20,00:30,...)

  (In Ubuntu)

  The Question is :

  When I use ffmpeg to transcode one of the media segment (ex 800k bps to 200k bps)

  the start time of transcoded media segment will be reset to 0

  ex:As I transcode the third segement,

  start time of segments changing to : 00:00,00:10,00:00,00:30,...

  It cause my player freezing once play the transcoded media segment

  Is there any solution to transcode media file with the same start time ?

  I guess it's the ffmpeg reset the PTS(presentation timestamp) of segment

  But I don't know how to fix it...

  here is my ffmpeg command (transcode to 250k bps)

  ============================

  ffmpeg -y -i sample-03.ts -f mpegts -acodec libfaac -ar 48000 -ab 64k -vcodec libx264 -b 250k -flags +loop -cmp +chroma \
  
   -partitions +parti4x4+partp8x8+partb8x8 -subq 7 -trellis 0 -refs 0 -coder 0 -me_range 16 -keyint_min 25 \
  
   -sc_threshold 40 -i_qfactor 0.71 -maxrate 250k -bufsize 250k -rc_eq 'blurCplx^(1-qComp)' -qcomp 0.6 \
  
   -qmin 10 -qmax 51 -qdiff 4 -level 30 -aspect 320:240 -g 30 -async 2 sample.ts

  ============================

  Help !

  thanks