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• ffmpeg : Merge multiple mpeg videos while switching audio tracks

  12 octobre 2015, par Mark Schneider

  I have 7 mpeg files that were converted from images and videos as follows :

  001.mpeg - created from a still image
  002.mpeg - created from a still image
  003.mpeg - video with an audio track
  004.mpeg - created from a still image
  005.mpeg - video with an audio track
  006.mpeg - created from a still image

  I need to concatenate them together along with an audio soundtrack into a single mp4 file. While the mpeg files created from images are being displayed, I’d like to hear the audio soundtrack, however, while the videos (003.mpeg and 005.mpeg) are being displayed, I’d like to hear their respective audio tracks instead of the soundtrack.

  I’m able to stitch together the files with the audio soundtrack playing throughout using these commands :

  ffmpeg -i concat:"001.mpeg|002.mpeg|003.mpeg|004.mpeg|005.mpeg|007.mpeg" -c copy video_before_adding_audio.mp4

  ffmpeg i video_before_adding_audio.mp4 -i soundtrack.mp3 -map 0:0 -map 1 -vcodec copy -acodec aac -strict experimental -shortest vue.mp4

  Is there a way to get ffmpeg to “duck” the audio soundtrack down to 10% volume while the videos are being shown ? If not, is there a way to duck the audio entirely while those files are being shown ?

  As a secondary question, so as to not have abrupt changes in the sound when switching between the soundtrack and the video’s audio tracks, is there a way to instruct ffmpeg fade the soundtrack out just as 003.mpeg is being reached (maybe over 1/4 second) and to fade it back in when 004.mpeg starts (and to the same for 005.mpeg and 006.mpeg) ?

  Here is the ffprobe output for the 003.mpeg and 005.mpeg files :

  ffprobe version 2.5 Copyright (c) 2007-2014 the FFmpeg developers
  
    built on Dec 10 2014 19:03:38 with Apple LLVM version 6.0 (clang-600.0.56) (based on LLVM 3.5svn)
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/2.5 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-libx264 --enable-libmp3lame --enable-libxvid --enable-libvo-aacenc --enable-vda
  
    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, mpegts, from '006.vuepart.mpeg':
  
    Duration: 00:00:07.59, start: 1.555756, bitrate: 2356 kb/s
  
    Program 1
  
      Metadata:
  
        service_name    : Service01
  
        service_provider: FFmpeg
  
      Stream #0:0[0x100]: Video: h264 (Main) ([27][0][0][0] / 0x001B), yuv420p, 800x600, 12 fps, 12 tbr, 90k tbn, 24 tbc
  
      Stream #0:1[0x101](und): Audio: mp2 ([3][0][0][0] / 0x0003), 44100 Hz, mono, s16p, 384 kb/s

  Here is the ffprobe output for the mpeg file created from still images :

  ffprobe version 2.5 Copyright (c) 2007-2014 the FFmpeg developers
  
    built on Dec 10 2014 19:03:38 with Apple LLVM version 6.0 (clang-600.0.56) (based on LLVM 3.5svn)
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/2.5 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-libx264 --enable-libmp3lame --enable-libxvid --enable-libvo-aacenc --enable-vda
  
    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, mpegts, from '001.vuepart.mpeg':
  
    Duration: 00:00:02.54, start: 1.522422, bitrate: 609 kb/s
  
    Program 1
  
      Metadata:
  
        service_name    : Service01
  
        service_provider: FFmpeg
  
      Stream #0:0[0x100]: Video: h264 (High) ([27][0][0][0] / 0x001B), yuvj420p(pc), 800x600 [SAR 1:1 DAR 4:3], 15 fps, 15 tbr, 90k tbn, 30 tbc
  
      Stream #0:1[0x101]: Audio: mp2 ([3][0][0][0] / 0x0003), 44100 Hz, mono, s16p, 384 kb/s

  Note : I’ve added a silent audio track to the still images.

• opening ffmpeg/mpeg-4 avi in openCV 3 python 2.7

  8 février 2016, par jlarsch

  I am stuck trying to open a mpeg4 video file in openCV. The video file was generated in ffmpeg using this command :

  ffmpeg -y -f rawvideo -vcodec rawvideo -s 2048x2048 -r 30 -pix_fmt gray -i \\.\pipe\pipe1 -qv 5 -vcodec mpeg4 out.avi

  now I am trying to open the file like this

  import cv2
  
  #avi_path is full path to avi
  
  cap = cv2.VideoCapture(avi_path)
  
  img1=cap.read()

  but this returns : False, none

  The same procedure works fine if I use libxvid for encoding instead but I want to use mpeg4 because it encodes faster (I need to encode several streams simultaneously).

  Should openCV be able to open the mpeg4 encoded avi file ?

  I am using openCV3 and python 2.7 under Windows 64bit

  I am also attaching GSpot panels of one video encoded in xvid (left) which I can open. And one video encoded in mpeg4 (right) which I cannot open.
  
  I have a suspicion that some LAV splitter/decoder settings may interfere ?! - but I don’t understand enough of that to get to the bottom of it.

  This is my ffprobe output for the mpeg4 file encoded with the additional ffmpeg parameter ’-vtag xvid’ as suggested in a comment by Mulvya

    ffprobe version N-75474-g74e4948 Copyright (c) 2007-2015 the FFmpeg developers
  
    built with gcc 4.9.3 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libdcadec --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-lzma --enable-decklink --enable-zlib
  
    libavutil      55.  2.100 / 55.  2.100
  
    libavcodec     57.  3.100 / 57.  3.100
  
    libavformat    57.  2.100 / 57.  2.100
  
    libavdevice    57.  0.100 / 57.  0.100
  
    libavfilter     6.  6.100 /  6.  6.100
  
    libswscale      4.  0.100 /  4.  0.100
  
    libswresample   2.  0.100 /  2.  0.100
  
    libpostproc    54.  0.100 / 54.  0.100
  
  Input #0, avi, from 'out1b.avi':
  
    Metadata:
  
      encoder         : Lavf57.2.100
  
    Duration: 00:00:23.50, start: 0.000000, bitrate: 2049 kb/s
  
      Stream #0:0: Video: mpeg4 (Simple Profile) (xvid / 0x64697678), yuv420p, 2048x2048 [SAR 1:1 DAR 1:1], 2044 kb/s, 30 fps, 30 tbr, 30 tbn, 30 tbc

• FFmpeg : Concatenating two huffyuv codec files in .avi container causing first video to be fine but other video is just static

  15 octobre 2015, par roy

  I have two .avi video files that I am trying to concat together.

  I have a files.txt that has in it :

  file './1_tmp.avi'
  
  file './2_tmp.avi'

  FFprobe for 1_tmp.avi gives me :

  ffprobe version 2.7.2 Copyright (c) 2007-2015 the FFmpeg developers
  
    built with gcc 4.8.5 (Gentoo 4.8.5 p1.3, pie-0.6.2)
  
    configuration: --prefix=/usr --libdir=/usr/lib64 --shlibdir=/usr/lib64 --mandir=/usr/share/man --enable-shared --cc=x86_64-pc-linux-gnu-gcc --cxx=x86_64-pc-linux-gnu-g++ --ar=x86_64-pc-linux-gnu-ar --optflags=' ' --disable-static --enable-avfilter --enable-avresample --disable-stripping --enable-version3 --disable-indev=v4l2 --disable-outdev=v4l2 --disable-indev=oss --disable-indev=jack --disable-outdev=oss --disable-outdev=sdl --enable-nonfree --enable-bzlib --disable-runtime-cpudetect --disable-debug --disable-doc --disable-gnutls --enable-gpl --enable-hardcoded-tables --enable-iconv --disable-lzma --enable-network --disable-openssl --enable-postproc --disable-libsmbclient --disable-ffplay --disable-vaapi --disable-vdpau --enable-xlib --disable-libxcb --disable-libxcb-shm --disable-libxcb-xfixes --enable-zlib --disable-libcdio --disable-libiec61883 --disable-libdc1394 --disable-libcaca --disable-openal --disable-opengl --disable-libv4l2 --disable-libpulse --disable-libopencore-amrwb --disable-libopencore-amrnb --enable-libfdk-aac --disable-libopenjpeg --disable-libbluray --disable-libcelt --disable-libgme --disable-libgsm --disable-libmodplug --disable-libopus --disable-libquvi --disable-librtmp --disable-libssh --disable-libschroedinger --disable-libspeex --disable-libvorbis --enable-libvpx --disable-libzvbi --disable-libbs2b --disable-libflite --disable-frei0r --disable-libfribidi --disable-fontconfig --disable-ladspa --disable-libass --disable-libfreetype --disable-libsoxr --enable-pthreads --enable-libvo-aacenc --disable-libvo-amrwbenc --enable-libmp3lame --disable-libaacplus --disable-libfaac --disable-libtheora --disable-libtwolame --disable-libwavpack --disable-libwebp --enable-libx264 --disable-libx265 --disable-libxvid --enable-x11grab --disable-amd3dnow --disable-amd3dnowext --disable-fma4 --disable-xop --cpu=core-avx-i
  
    libavutil      54. 27.100 / 54. 27.100
  
    libavcodec     56. 41.100 / 56. 41.100
  
    libavformat    56. 36.100 / 56. 36.100
  
    libavdevice    56.  4.100 / 56.  4.100
  
    libavfilter     5. 16.101 /  5. 16.101
  
    libavresample   2.  1.  0 /  2.  1.  0
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  2.100 /  1.  2.100
  
    libpostproc    53.  3.100 / 53.  3.100
  
  Input #0, avi, from '1_tmp.avi':
  
    Metadata:
  
      encoder         : Lavf56.36.100
  
    Duration: 00:00:19.00, start: 0.000000, bitrate: 179869 kb/s
  
      Stream #0:0: Video: huffyuv (HFYU / 0x55594648), bgr0, 1024x768, 180390 kb/s, 18 fps, 18 tbr, 18 tbn, 18 tbc

  and for 2_tmp.avi :

  ffprobe version 2.7.2 Copyright (c) 2007-2015 the FFmpeg developers
  
    built with gcc 4.8.5 (Gentoo 4.8.5 p1.3, pie-0.6.2)
  
    configuration: --prefix=/usr --libdir=/usr/lib64 --shlibdir=/usr/lib64 --mandir=/usr/share/man --enable-shared --cc=x86_64-pc-linux-gnu-gcc --cxx=x86_64-pc-linux-gnu-g++ --ar=x86_64-pc-linux-gnu-ar --optflags=' ' --disable-static --enable-avfilter --enable-avresample --disable-stripping --enable-version3 --disable-indev=v4l2 --disable-outdev=v4l2 --disable-indev=oss --disable-indev=jack --disable-outdev=oss --disable-outdev=sdl --enable-nonfree --enable-bzlib --disable-runtime-cpudetect --disable-debug --disable-doc --disable-gnutls --enable-gpl --enable-hardcoded-tables --enable-iconv --disable-lzma --enable-network --disable-openssl --enable-postproc --disable-libsmbclient --disable-ffplay --disable-vaapi --disable-vdpau --enable-xlib --disable-libxcb --disable-libxcb-shm --disable-libxcb-xfixes --enable-zlib --disable-libcdio --disable-libiec61883 --disable-libdc1394 --disable-libcaca --disable-openal --disable-opengl --disable-libv4l2 --disable-libpulse --disable-libopencore-amrwb --disable-libopencore-amrnb --enable-libfdk-aac --disable-libopenjpeg --disable-libbluray --disable-libcelt --disable-libgme --disable-libgsm --disable-libmodplug --disable-libopus --disable-libquvi --disable-librtmp --disable-libssh --disable-libschroedinger --disable-libspeex --disable-libvorbis --enable-libvpx --disable-libzvbi --disable-libbs2b --disable-libflite --disable-frei0r --disable-libfribidi --disable-fontconfig --disable-ladspa --disable-libass --disable-libfreetype --disable-libsoxr --enable-pthreads --enable-libvo-aacenc --disable-libvo-amrwbenc --enable-libmp3lame --disable-libaacplus --disable-libfaac --disable-libtheora --disable-libtwolame --disable-libwavpack --disable-libwebp --enable-libx264 --disable-libx265 --disable-libxvid --enable-x11grab --disable-amd3dnow --disable-amd3dnowext --disable-fma4 --disable-xop --cpu=core-avx-i
  
    libavutil      54. 27.100 / 54. 27.100
  
    libavcodec     56. 41.100 / 56. 41.100
  
    libavformat    56. 36.100 / 56. 36.100
  
    libavdevice    56.  4.100 / 56.  4.100
  
    libavfilter     5. 16.101 /  5. 16.101
  
    libavresample   2.  1.  0 /  2.  1.  0
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  2.100 /  1.  2.100
  
    libpostproc    53.  3.100 / 53.  3.100
  
  Input #0, avi, from '2_tmp.avi':
  
    Metadata:
  
      encoder         : Lavf56.36.100
  
    Duration: 00:00:56.00, start: 0.000000, bitrate: 160560 kb/s
  
      Stream #0:0: Video: huffyuv (HFYU / 0x55594648), bgr0, 1024x768, 160714 kb/s, 18 fps, 18 tbr, 18 tbn, 18 tbc

  There are only video streams, they look to be the same codecs/fps

  I am using this command to concatenate them :

  ffmpeg -f concat -i files.txt -c:v copy -y output.avi

  I don’t get any output from the terminal and it outputs a file.

  The file opens and the content in 1_tmp.avi plays fine, at the same quality, but when it gets to the point in the video where 2_tmp.avi should be, it’s pixelated static all the way through (see image below).

  

  If I use a command like :

  ffmpeg -i 1_tmp.avi -i 2_tmp.avi -filter_complex "[0:0] [1:0] concat=n=2:v=1 [v]" -map "[v]" output.avi

  I do get full output of both videos merged together, but it is dropped to an mpeg codec and the quality loss is noticeably prominent.