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• FFMPEG incorrect duration from raw video stream

  28 juillet 2020, par LMB

  I have the raw video data from a video stream (no audio) and the duration when I play the raw video in VLC is 67 seconds. When I convert the file to MP4 using FFMPEG the duration is 82.68 seconds.

  


  Video is available here : https://www.filedropper.com/showdownload.php/67seconds
I am using FFMPEG/FFPROBE version git-2020-07-21-b5f1e05 on Windows.

  


  Details of the raw video here :

  


  ffprobe -i 67seconds.raw
ffprobe version git-2020-07-21-b5f1e05 Copyright (c) 2007-2020 the FFmpeg developers
  built with gcc 9.3.1 (GCC) 20200621
  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-libsrt --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-libvmaf --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libgsm --disable-w32threads --enable-libmfx --enable-ffnvcodec --enable-cuda-llvm --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt --enable-amf
  libavutil      56. 55.100 / 56. 55.100
  libavcodec     58. 97.100 / 58. 97.100
  libavformat    58. 49.100 / 58. 49.100
  libavdevice    58. 11.101 / 58. 11.101
  libavfilter     7. 87.100 /  7. 87.100
  libswscale      5.  8.100 /  5.  8.100
  libswresample   3.  8.100 /  3.  8.100
  libpostproc    55.  8.100 / 55.  8.100
Input #0, h264, from '67seconds.raw':
  Duration: N/A, bitrate: N/A
    Stream #0:0: Video: h264 (High), yuv420p(progressive), 640x360 [SAR 1:1 DAR 16:9], 25 fps, 25 tbr, 1200k tbn, 50 tbc


  


  The mp4 duration matches my ffprobe calculation against the raw file itself (2067/25 = 82.68 seconds) :

  


  ffprobe -show_entries stream=r_frame_rate,nb_read_frames -select_streams v -count_frames -of compact=p=0:nk=1 -v 0 67seconds.raw
25/1|2067


  


  What would explain this difference in durations between the raw playback and the FFMPEG interpretation and how do I encode to the same duration for this and other stream data ?

  


• 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 !