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• Sound is lost when concatenate several videos with ffmpeg

  18 août 2020, par Yevhenii Molodtsov

  I have a python script that generates an FFmpeg command and then runs it with shell.
Everything is going okay (the videos are concatenated, the needed cross-dissolve effect is also great), but there are two problems I am trying to fix :

  


  

  1. The output loses the sound.

  


  2. The output is frizzing a little bit (it seems like there are about 10 fps).

  


  


  The example of command generatede by the script is here :

  


  ffmpeg -i /tmp/media/import-2020-Aug-18-Tuesday-08-31-10/temp_8ce3c8ac-
1379-4a16-b141-ebdc910e1142.mp4 -i /tmp/media/import-2020-Aug-18-
Tuesday-08-31-10/temp_d9f60ffb-0a83-4052-8ebb-620a574d1871.mp4 -i 
/tmp/media/import-2020-Aug-18-Tuesday-08-31-10/temp_93934eaa-9589-4736-
8d11-fd8c1bdf0b92.mp4  -filter_complex "
[0:v]trim=start=0:end=4.038,setpts=PTS-STARTPTS[clip0];
[1:v]trim=start=2:end=4.038,setpts=PTS-STARTPTS[clip1];
[2:v]trim=start=2,setpts=PTS-STARTPTS[clip2];
[0:v]trim=start=5.038:end=6.038,setpts=PTS-STARTPTS[out0];
[1:v]trim=start=5.038:end=6.038,setpts=PTS-STARTPTS[out1];
[1:v]trim=start=0:end=2,setpts=PTS-STARTPTS[in1];
[2:v]trim=start=0:end=2,setpts=PTS-STARTPTS[in2];
[in1]format=pix_fmts=yuva420p,fade=t=in:st=0:d=2:alpha=1[fadein1];
[in2]format=pix_fmts=yuva420p,fade=t=in:st=0:d=2:alpha=1[fadein2];
[out0]format=pix_fmts=yuva420p,fade=t=out:st=0:d=2:alpha=1[fadeout0];
[out1]format=pix_fmts=yuva420p,fade=t=out:st=0:d=2:alpha=1[fadeout1];
[fadein1]fifo[fadein1fifo];[fadein2]fifo[fadein2fifo];
[fadeout0]fifo[fadeout0fifo];[fadeout1]fifo[fadeout1fifo];[fadeout0fifo]
[fadein1fifo]overlay[crossfade0];[fadeout1fifo]
[fadein2fifo]overlay[crossfade1];[clip0][crossfade0][clip1][crossfade1]
[clip2]concat=n=5[output]" -map "[output]" 
/tmp/media/final/some_filename_c8e898b2-e3f7-4656-b3b9-1e8fb93cd75c.mp4


  


  I would much appreciate any help because I am new to this tool and here I got stuck.

  


• Getting "Buffer queue overflow, dropping" while concatenation in ffmpeg

  19 août 2020, par Yevhenii Molodtsov

  I have a python script that generates the FFmpeg command to concatenate the video clips.
Here is the script :

  


          ffmpeg 
        -i /tmp/media/import-2020-Aug-19-Wednesday-08-08-26/temp_eba59811-bb5c-4e36-aa7d-b1731e70432c.mp4 
        -i /tmp/media/import-2020-Aug-19-Wednesday-08-08-26/temp_2a6d7907-7cad-4f38-ae82-4b475546d3e0.mp4 
        -i /tmp/media/import-2020-Aug-19-Wednesday-08-08-26/temp_d7371ecb-01df-4199-951f-336fa475998f.mp4 
        -i /tmp/media/import-2020-Aug-19-Wednesday-08-08-26/temp_cc5de0f1-84b4-47bc-b390-45b5f8711914.mp4 
        -i /tmp/media/import-2020-Aug-19-Wednesday-08-08-26/temp_bf796e0d-135f-40fd-ab8e-4780da6973fd.mp4  
        -filter_complex 
        "[0:v]trim=start=0:end=8.032,setpts=PTS-STARTPTS[clip0];
        [1:v]trim=start=2:end=13.047,setpts=PTS-STARTPTS[clip1];
        [2:v]trim=start=2:end=13.558,setpts=PTS-STARTPTS[clip2];
        [3:v]trim=start=2:end=13.186,setpts=PTS-STARTPTS[clip3];
        [4:v]trim=start=2,setpts=PTS-STARTPTS[clip4];
        [0:v]trim=start=9.032:end=10.032,setpts=PTS-STARTPTS[out0];
        [1:v]trim=start=14.047:end=15.047,setpts=PTS-STARTPTS[out1];
        [2:v]trim=start=14.558:end=15.558,setpts=PTS-STARTPTS[out2];
        [3:v]trim=start=14.186:end=15.186,setpts=PTS-STARTPTS[out3];
        [1:v]trim=start=0:end=2,setpts=PTS-STARTPTS[in1];
        [2:v]trim=start=0:end=2,setpts=PTS-STARTPTS[in2];
        [3:v]trim=start=0:end=2,setpts=PTS-STARTPTS[in3];
        [4:v]trim=start=0:end=2,setpts=PTS-STARTPTS[in4];
        [in1]format=pix_fmts=yuva420p,fade=t=in:st=0:d=2:alpha=1[fadein1];
        [in2]format=pix_fmts=yuva420p,fade=t=in:st=0:d=2:alpha=1[fadein2];
        [in3]format=pix_fmts=yuva420p,fade=t=in:st=0:d=2:alpha=1[fadein3];
        [in4]format=pix_fmts=yuva420p,fade=t=in:st=0:d=2:alpha=1[fadein4];
        [out0]format=pix_fmts=yuva420p,fade=t=out:st=0:d=2:alpha=1[fadeout0];
        [out1]format=pix_fmts=yuva420p,fade=t=out:st=0:d=2:alpha=1[fadeout1];
        [out2]format=pix_fmts=yuva420p,fade=t=out:st=0:d=2:alpha=1[fadeout2];
        [out3]format=pix_fmts=yuva420p,fade=t=out:st=0:d=2:alpha=1[fadeout3];
        [fadein1]fifo[fadein1fifo];
        [fadein2]fifo[fadein2fifo];
        [fadein3]fifo[fadein3fifo];
        [fadein4]fifo[fadein4fifo];
        [fadeout0]fifo[fadeout0fifo];
        [fadeout1]fifo[fadeout1fifo];
        [fadeout2]fifo[fadeout2fifo];
        [fadeout3]fifo[fadeout3fifo];
        [fadeout0fifo][fadein1fifo]overlay[crossfade0];
        [fadeout1fifo][fadein2fifo]overlay[crossfade1];
        [fadeout2fifo][fadein3fifo]overlay[crossfade2];
        [fadeout3fifo][fadein4fifo]overlay[crossfade3];
        [clip0][crossfade0][clip1][crossfade1][clip2][crossfade2][clip3][crossfade3][clip4]concat=n=9[output];
         [0:a][1:a]acrossfade=d=10:c1=tri:c2=tri[A1];
         [A1][2:a]acrossfade=d=10:c1=tri:c2=tri[A2];
         [A2][3:a]acrossfade=d=10:c1=tri:c2=tri[A3];
         [A3][4:a]acrossfade=d=10:c1=tri:c2=tri[audio] " -map "[output]" -map "[audio]" /tmp/media/final/some_filename_587463a2-e3ca-436a-874b-a72e295e46ac.mp4


  


  But I get the following error : Buffer queue overflow, dropping.
I read that to solve this I need to use fifo, but I can't figure out where should I place it. I addition, it seems like fifo works only with video streams.
I would much appreciate any help !

  


• Why does ffmpeg output frames starting with 0001 instead of 0000 ? [closed]

  3 février 2020, par AMTQ

  I’m using ffmpeg to extract frames from a video. It all works well but something seems strange : The numbering of the output always starts with 0001 instead of 0000. Below a minimum working example, the output from the console and a picture of the generated frames. I’m using windows shell on Win10.

  ffmpeg -i P1390752.MP4 -vframes 4 frame%%04d.png

  Console output :

  C:\Users\xxxx>ffmpeg -i P1390752.MP4 -vframes 4 frame%04d.png
  
  ffmpeg version git-2020-01-15-0dc0837 Copyright (c) 2000-2020 the FFmpeg developers
  
    built with gcc 9.2.1 (GCC) 20200111
  
    configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt --enable-amf
  
    libavutil      56. 38.100 / 56. 38.100
  
    libavcodec     58. 65.103 / 58. 65.103
  
    libavformat    58. 35.102 / 58. 35.102
  
    libavdevice    58.  9.103 / 58.  9.103
  
    libavfilter     7. 71.100 /  7. 71.100
  
    libswscale      5.  6.100 /  5.  6.100
  
    libswresample   3.  6.100 /  3.  6.100
  
    libpostproc    55.  6.100 / 55.  6.100
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 000002341f489e40] st: 0 edit list: 1 Missing key frame while searching for timestamp: 3600
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 000002341f489e40] st: 0 edit list 1 Cannot find an index entry before timestamp: 3600.
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'P1390752.MP4':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 1
  
      compatible_brands: mp42avc1
  
      creation_time   : 2020-01-29T13:35:55.000000Z
  
    Duration: 00:00:08.16, start: 0.000000, bitrate: 27084 kb/s
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 1920x1080 [SAR 1:1 DAR 16:9], 26830 kb/s, 50 fps, 50 tbr, 180k tbn, 100 tbc (default)
  
      Metadata:
  
        creation_time   : 2020-01-29T13:35:55.000000Z
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 124 kb/s (default)
  
      Metadata:
  
        creation_time   : 2020-01-29T13:35:55.000000Z
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 (native) -> png (native))
  
  Press [q] to stop, [?] for help
  
  Output #0, image2, to 'frame%04d.png':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 1
  
      compatible_brands: mp42avc1
  
      encoder         : Lavf58.35.102
  
      Stream #0:0(und): Video: png, rgb24, 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 50 fps, 50 tbn, 50 tbc (default)
  
      Metadata:
  
        creation_time   : 2020-01-29T13:35:55.000000Z
  
        encoder         : Lavc58.65.103 png
  
  frame=    4 fps=0.0 q=-0.0 Lsize=N/A time=00:00:00.08 bitrate=N/A speed=0.0922x
  
  video:5622kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown

  What I tried so far :
  1) I restricted the output to 4 frames because otherwise it would take ages. But the problem remains the same when I remove the number of frames and extract the whole video. The problem persists when using a starting point with -ss and a duration.
  2) When I use jpg as output I get some warnings about depreceated pixel format, but the numbering issue remains.

  I can not get rid of the first two warnings concerning the keyframe, maybe this is related ?