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• Different results in capturing a video, convert to frames then convert to the video again

  30 mai 2019, par Sam

  I’m working on an idea and in the first stage, I have one requirement which I capture a video and convert this video to a series of frames(pictures) and then convert frames to another video again.
  For reaching this goal I got three tasks :

  1. Capture a video :
     I have done this step by following ffmpeg command :

     ffmpeg -f gdigrab -framerate 10 -i desktop d:\video_1.avi

  2. Covert the generated video to images :

     ffmpeg -i d:\video_1.avi -vf fps=10  d:\frames\frame_%04d.bmp 

  3. Finally, convert images to another video again :

     ffmpeg -framerate 10 -i d:\frames\frame_%04d.bmp  d:\out_video_1.avi

  When I compared video_1.avi and out_video_1.avi I saw these videos had different size. The difference is about 30 kb in the six-second video.
  I compared two videos by Matlab and saw two videos are really different.

  I need to be sure that two videos are the same for continuing to work on other stages of my idea but I was stuck at this stage.

• FFMPEG results in a silent video when trying to combine video and audio tracks

  23 septembre 2017, par Stuart Clarke

  I’m using the following command to combine a video and an audio track.

  ffmpeg -y -i /var/www/temp/merged.mp4 -i /var/www/temp/combined.mp3 -strict -2 /var/www/temp/videoExtouiulbjryzxlehjj2.mp4

  Edit :

  Here is the output from the first command

  ffmpeg version 2.5.10-0ubuntu0.15.04.1 Copyright (c) 2000-2016 the FFmpeg developers
  
    built with gcc 4.9.2 (Ubuntu 4.9.2-10ubuntu13)
  
    configuration: --prefix=/usr --extra-version=0ubuntu0.15.04.1 --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --shlibdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --enable-shared --disable-stripping --enable-avresample --enable-avisynth --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-libschroedinger --enable-libshine --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libwavpack --enable-libwebp --enable-libxvid --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzvbi --enable-libzmq --enable-frei0r --enable-libvpx --enable-libx264 --enable-libsoxr --enable-gnutls --enable-openal --enable-libopencv --enable-librtmp --enable-libx265
  
    libavutil      54. 15.100 / 54. 15.100
  
    libavcodec     56. 13.100 / 56. 13.100
  
    libavformat    56. 15.102 / 56. 15.102
  
    libavdevice    56.  3.100 / 56.  3.100
  
    libavfilter     5.  2.103 /  5.  2.103
  
    libavresample   2.  1.  0 /  2.  1.  0
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  1.100 /  1.  1.100
  
    libpostproc    53.  3.100 / 53.  3.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/var/www/temp/merged.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf56.15.102
  
    Duration: 00:02:31.80, start: 0.000000, bitrate: 2384 kb/s
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 2381 kb/s, 25.43 fps, 29.97 tbr, 11988 tbn, 59.94 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 0 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
  Input #1, mp3, from '/var/www/temp/audioTrack.mp3':
  
    Metadata:
  
      encoder         : Lavf56.15.102
  
    Duration: 00:02:08.94, start: 0.011995, bitrate: 128 kb/s
  
      Stream #1:0: Audio: mp3, 44100 Hz, stereo, s16p, 128 kb/s
  
      Metadata:
  
        encoder         : Lavf
  
  [libx264 @ 0x1e903a0] using SAR=1/1
  
  [libx264 @ 0x1e903a0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX AVX2 FMA3 LZCNT BMI2
  
  [libx264 @ 0x1e903a0] profile High, level 4.0
  
  [libx264 @ 0x1e903a0] 264 - core 142 r2495 6a301b6 - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
  
  Output #0, mp4, to '/var/www/temp/videoExtvzxvphotsyfpcbkd.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf56.15.102
  
      Stream #0:0(und): Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], q=-1--1, 29.97 fps, 30k tbn, 29.97 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
        encoder         : Lavc56.13.100 libx264
  
      Stream #0:1(und): Audio: mp3 (libmp3lame) (i[0][0][0] / 0x0069), 48000 Hz, stereo, fltp (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
        encoder         : Lavc56.13.100 libmp3lame
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
  
    Stream #0:1 -> #0:1 (aac (native) -> mp3 (libmp3lame))
  
  Press [q] to stop, [?] for help
  
  frame=   31 fps=0.0 q=0.0 size=       0kB time=00:00:01.05 bitrate=   0.4kbits/s dup=1 drop=0frame=   46 fps= 41 q=0.0 size=       0kB time=00:00:01.56 bitrate=   0.2kbits/s dup=1 drop=0frame=   52 fps= 32 q=29.0 size=     149kB time=00:00:01.75 bitrate= 698.4kbits/s dup=1 drop=frame=   64 fps= 28 q=29.0 size=     258kB time=00:00:02.16 bitrate= 977.2kbits/s dup=1 drop=frame=   74 fps= 26 q=29.0 size=     389kB   
  
  video:39673kB audio:211kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.143487%
  
  [libx264 @ 0x1e903a0] frame I:27    Avg QP:18.78  size: 58834
  
  [libx264 @ 0x1e903a0] frame P:2202  Avg QP:23.67  size: 14187
  
  [libx264 @ 0x1e903a0] frame B:2323  Avg QP:25.75  size:  3356
  
  [libx264 @ 0x1e903a0] consecutive B-frames: 24.7% 18.7%  9.0% 47.5%
  
  [libx264 @ 0x1e903a0] mb I  I16..4: 18.8% 74.7%  6.5%
  
  [libx264 @ 0x1e903a0] mb P  I16..4:  2.1%  5.0%  0.3%  P16..4: 22.2%  6.0%  1.9%  0.0%  0.0%    skip:62.5%
  
  [libx264 @ 0x1e903a0] mb B  I16..4:  0.1%  0.3%  0.0%  B16..8: 19.9%  1.0%  0.1%  direct: 0.3%  skip:78.3%  L0:42.3% L1:55.3% BI: 2.4%
  
  [libx264 @ 0x1e903a0] 8x8 transform intra:68.2% inter:86.5%
  
  [libx264 @ 0x1e903a0] coded y,uvDC,uvAC intra: 35.8% 52.3% 4.5% inter: 5.2% 7.4% 0.0%
  
  [libx264 @ 0x1e903a0] i16 v,h,dc,p: 28% 23%  8% 40%
  
  [libx264 @ 0x1e903a0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 27% 20% 22%  3%  6%  6%  7%  5%  4%
  
  [libx264 @ 0x1e903a0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 32% 21% 14%  4%  8%  7%  7%  4%  3%
  
  [libx264 @ 0x1e903a0] i8c dc,h,v,p: 56% 18% 20%  6%
  
  [libx264 @ 0x1e903a0] Weighted P-Frames: Y:0.9% UV:0.2%
  
  [libx264 @ 0x1e903a0] ref P L0: 73.4% 13.0% 10.0%  3.6%  0.0%
  
  [libx264 @ 0x1e903a0] ref B L0: 92.2%  6.7%  1.1%
  
  [libx264 @ 0x1e903a0] ref B L1: 96.6%  3.4%
  
  [libx264 @ 0x1e903a0] kb/s:2139.74

  End Edit

  I know this should work since the exact line does work for other files. But the result with these is a silent video.

  I checked the audio file being used and it seemed fine when played. but I did get a weird warning when creating it. Basically I have 2 audio tracks, one is overlay music and the other is talking. I create the combined audio with this command.

  ffmpeg -y -i /var/www/temp/audioTrack.mp3 -i /var/www/temp/musicTrack.mp3 -filter_complex amerge -c:a libmp3lame -q:a 4 /var/www/temp/combined.mp3

  Here is the output from the second command.

  ffmpeg version 2.5.10-0ubuntu0.15.04.1 Copyright (c) 2000-2016 the FFmpeg developers
  
    built with gcc 4.9.2 (Ubuntu 4.9.2-10ubuntu13)
  
    configuration: --prefix=/usr --extra-version=0ubuntu0.15.04.1 --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --shlibdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --enable-shared --disable-stripping --enable-avresample --enable-avisynth --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-libschroedinger --enable-libshine --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libwavpack --enable-libwebp --enable-libxvid --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzvbi --enable-libzmq --enable-frei0r --enable-libvpx --enable-libx264 --enable-libsoxr --enable-gnutls --enable-openal --enable-libopencv --enable-librtmp --enable-libx265
  
    libavutil      54. 15.100 / 54. 15.100
  
    libavcodec     56. 13.100 / 56. 13.100
  
    libavformat    56. 15.102 / 56. 15.102
  
    libavdevice    56.  3.100 / 56.  3.100
  
    libavfilter     5.  2.103 /  5.  2.103
  
    libavresample   2.  1.  0 /  2.  1.  0
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  1.100 /  1.  1.100
  
    libpostproc    53.  3.100 / 53.  3.100
  
  Input #0, mp3, from '/var/www/temp/audioTrack.mp3':
  
    Metadata:
  
      encoder         : Lavf56.15.102
  
    Duration: 00:02:08.89, start: 0.025057, bitrate: 128 kb/s
  
      Stream #0:0: Audio: mp3, 44100 Hz, stereo, s16p, 128 kb/s
  
      Metadata:
  
        encoder         : Lavc56.13
  
  Input #1, mp3, from '/var/www/temp/musicTrack.mp3':
  
    Metadata:
  
      encoder         : Lavf56.15.102
  
    Duration: 00:02:08.89, start: 0.025057, bitrate: 128 kb/s
  
      Stream #1:0: Audio: mp3, 44100 Hz, stereo, s16p, 128 kb/s
  
      Metadata:
  
        encoder         : Lavc56.13
  
  [Parsed_amerge_0 @ 0x15e3760] No channel layout for input 1
  
  [Parsed_amerge_0 @ 0x15e3760] Input channel layouts overlap: output layout will be determined by the number of distinct input channels
  
  Output #0, mp3, to '/var/www/temp/combined.mp3':
  
    Metadata:
  
      TSSE            : Lavf56.15.102
  
      Stream #0:0: Audio: mp3 (libmp3lame), 44100 Hz, stereo, s16p (default)
  
      Metadata:
  
        encoder         : Lavc56.13.100 libmp3lame
  
  Stream mapping:
  
    Stream #0:0 (mp3) -> amerge:in0
  
    Stream #1:0 (mp3) -> amerge:in1
  
    amerge -> Stream #0:0 (libmp3lame)
  
  Press [q] to stop, [?] for help
  
  [libmp3lame @ 0x1601000] Trying to remove 1152 samples, but the queue is empty
  
  size=    2001kB time=00:02:08.88 bitrate= 127.2kbits/s    
  
  video:0kB audio:2001kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.012350%

  Of note is these sections (I believe).

  [Parsed_amerge_0 @ 0x15e3760] No channel layout for input 1
  
  [Parsed_amerge_0 @ 0x15e3760] Input channel layouts overlap: output layout will be determined by the number of distinct input channels

  and

  [libmp3lame @ 0x1601000] Trying to remove 1152 samples, but the queue is empty

  As I said the output audio file sounds correct.

  The Music and Audio tracks are created with AudioSegment in python from the pydub library. I’ve used this before with no issues. The code for this is as follows.

  sound = AudioSegment.from_mp3(audio)
  
  introSilence = AudioSegment.silent(duration=introLength)
  
  creditsSilence = AudioSegment.silent(duration=creditsLength)
  
  increasedAudio = sound + 12
  
  talking = introSilence + increasedAudio + creditsSilence
  
  talking.export(audioTrack, format="mp3")
  
  mus = AudioSegment.from_mp3(music)
  
  introMusic = mus[ : introLength]
  
  videoMusic = mus[introLength - crossFade : introLength + videoLength + crossFade]
  
  creditsMusic = mus[totalLength - creditsLength : totalLength]
  
  lowerMusic = videoMusic - 6
  
  totalMusic = introMusic.append(lowerMusic, crossfade=crossFade).append(creditsMusic, crossfade=crossFade).fade_out(fadeOut)
  
  totalMusic.export(musicTrack, format="mp3")

  Here is the output of ffprobe on the 2 audio files.

  for audioTrack

  ffprobe version 2.5.10-0ubuntu0.15.04.1 Copyright (c) 2007-2016 the FFmpeg developers
  
    built with gcc 4.9.2 (Ubuntu 4.9.2-10ubuntu13)
  
    configuration: --prefix=/usr --extra-version=0ubuntu0.15.04.1 --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --shlibdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --enable-shared --disable-stripping --enable-avresample --enable-avisynth --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-libschroedinger --enable-libshine --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libwavpack --enable-libwebp --enable-libxvid --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzvbi --enable-libzmq --enable-frei0r --enable-libvpx --enable-libx264 --enable-libsoxr --enable-gnutls --enable-openal --enable-libopencv --enable-librtmp --enable-libx265
  
    libavutil      54. 15.100 / 54. 15.100
  
    libavcodec     56. 13.100 / 56. 13.100
  
    libavformat    56. 15.102 / 56. 15.102
  
    libavdevice    56.  3.100 / 56.  3.100
  
    libavfilter     5.  2.103 /  5.  2.103
  
    libavresample   2.  1.  0 /  2.  1.  0
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  1.100 /  1.  1.100
  
    libpostproc    53.  3.100 / 53.  3.100
  
  Input #0, mp3, from 'temp/audioTrack.mp3':
  
    Metadata:
  
      encoder         : Lavf56.15.102
  
    Duration: 00:02:08.89, start: 0.025057, bitrate: 128 kb/s
  
      Stream #0:0: Audio: mp3, 44100 Hz, stereo, s16p, 128 kb/s
  
      Metadata:
  
        encoder         : Lavc56.13

  and for musicTrack

  ffprobe version 2.5.10-0ubuntu0.15.04.1 Copyright (c) 2007-2016 the FFmpeg developers
  
    built with gcc 4.9.2 (Ubuntu 4.9.2-10ubuntu13)
  
    configuration: --prefix=/usr --extra-version=0ubuntu0.15.04.1 --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --shlibdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --enable-shared --disable-stripping --enable-avresample --enable-avisynth --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-libschroedinger --enable-libshine --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libwavpack --enable-libwebp --enable-libxvid --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzvbi --enable-libzmq --enable-frei0r --enable-libvpx --enable-libx264 --enable-libsoxr --enable-gnutls --enable-openal --enable-libopencv --enable-librtmp --enable-libx265
  
    libavutil      54. 15.100 / 54. 15.100
  
    libavcodec     56. 13.100 / 56. 13.100
  
    libavformat    56. 15.102 / 56. 15.102
  
    libavdevice    56.  3.100 / 56.  3.100
  
    libavfilter     5.  2.103 /  5.  2.103
  
    libavresample   2.  1.  0 /  2.  1.  0
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  1.100 /  1.  1.100
  
    libpostproc    53.  3.100 / 53.  3.100
  
  Input #0, mp3, from 'temp/musicTrack.mp3':
  
    Metadata:
  
      encoder         : Lavf56.15.102
  
    Duration: 00:02:08.89, start: 0.025057, bitrate: 128 kb/s
  
      Stream #0:0: Audio: mp3, 44100 Hz, stereo, s16p, 128 kb/s
  
      Metadata:
  
        encoder         : Lavc56.13

  I can’t see any issues with these.

  For completeness here is the ffprobe result for the combined audio track.

  ffprobe version 2.5.10-0ubuntu0.15.04.1 Copyright (c) 2007-2016 the FFmpeg developers
  
    built with gcc 4.9.2 (Ubuntu 4.9.2-10ubuntu13)
  
    configuration: --prefix=/usr --extra-version=0ubuntu0.15.04.1 --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --shlibdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --enable-shared --disable-stripping --enable-avresample --enable-avisynth --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-libschroedinger --enable-libshine --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libwavpack --enable-libwebp --enable-libxvid --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzvbi --enable-libzmq --enable-frei0r --enable-libvpx --enable-libx264 --enable-libsoxr --enable-gnutls --enable-openal --enable-libopencv --enable-librtmp --enable-libx265
  
    libavutil      54. 15.100 / 54. 15.100
  
    libavcodec     56. 13.100 / 56. 13.100
  
    libavformat    56. 15.102 / 56. 15.102
  
    libavdevice    56.  3.100 / 56.  3.100
  
    libavfilter     5.  2.103 /  5.  2.103
  
    libavresample   2.  1.  0 /  2.  1.  0
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  1.100 /  1.  1.100
  
    libpostproc    53.  3.100 / 53.  3.100
  
  Input #0, mp3, from 'temp/combined.mp3':
  
    Metadata:
  
      encoder         : Lavf56.15.102
  
    Duration: 00:02:08.91, start: 0.025057, bitrate: 127 kb/s
  
      Stream #0:0: Audio: mp3, 44100 Hz, stereo, s16p, 127 kb/s
  
      Metadata:
  
        encoder         : Lavc56.13

  Any help would be much appreciated.

  Thanks,

  Stu.

• How can we transcode live rtmp stream to live hls stream using ffmpeg ?

  20 septembre 2016, par Kiran

  I am trying to convert a live rtmp stream to hls stream on real time.

  I got some idea after reading

  http://sonnati.wordpress.com/2011/08/30/ffmpeg-%E2%80%93-the-swiss-army-knife-of-internet-streaming-%E2%80%93-part-iv/

  i am able to convert the live rtmp stream to hls but not at run time. when i run the command and test for any hsl files (.m3u8 and .ts) i am not able to see but when i interrupt the command and check there i get the hls files as required.

  I searched on google for solution but not able to get proper answer.

  Can any body help me ?

  Thanks in Advance...