Recherche avancée

Sur d’autres sites (3054)

• Video concatenation puts sound out of sync

  9 août 2019, par mmorin

  (Cross-posted from Video Production, where the question received no answers and may be more technical than usual video production.)

  I have several MOV files from a DSLR camera. I concatenate them with directions from this thread :

  ffmpeg -safe 0 -f concat -i files_to_combine -vcodec copy -acodec copy temp.MOV

  where files_to_combine is :

  file ./DSC_0013.MOV
  
  ...
  
  file ./DSC_0019.MOV

  The result has image and sound in sync for the first clip and is out of sync by fractions of a second in the second clip, and out of sync by around a second for the last clip. It is probably related to this error from the log :

  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7f82dd802200] st: 0 edit list: 1 Missing key frame while searching for timestamp: 1000
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7f82dd802200] st: 0 edit list 1 Cannot find an index entry before timestamp: 1000.
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7f82dd802200] Auto-inserting h264_mp4toannexb bitstream filter

  How can I trim the frames to the available sound stream, then concatenate the two videos ?

  The full log from the ffmpeg command is :

  ffmpeg version 4.1.3 Copyright (c) 2000-2019 the FFmpeg developers
  
    built with Apple LLVM version 10.0.1 (clang-1001.0.46.4)
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/4.1.3_1 --enable-shared --enable-pthreads --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags='-I/Library/Java/JavaVirtualMachines/adoptopenjdk-11.0.2.jdk/Contents/Home/include -I/Library/Java/JavaVirtualMachines/adoptopenjdk-11.0.2.jdk/Contents/Home/include/darwin' --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libmp3lame --enable-libopus --enable-librubberband --enable-libsnappy --enable-libtesseract --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp --enable-libspeex --enable-videotoolbox --disable-libjack --disable-indev=jack --enable-libaom --enable-libsoxr
  
    libavutil      56. 22.100 / 56. 22.100
  
    libavcodec     58. 35.100 / 58. 35.100
  
    libavformat    58. 20.100 / 58. 20.100
  
    libavdevice    58.  5.100 / 58.  5.100
  
    libavfilter     7. 40.101 /  7. 40.101
  
    libavresample   4.  0.  0 /  4.  0.  0
  
    libswscale      5.  3.100 /  5.  3.100
  
    libswresample   3.  3.100 /  3.  3.100
  
    libpostproc    55.  3.100 / 55.  3.100
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7f82dc00e000] Auto-inserting h264_mp4toannexb bitstream filter
  
  Input #0, concat, from 'files_to_combine':
  
    Duration: N/A, start: -0.592000, bitrate: 36888 kb/s
  
      Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuvj420p(pc, smpte170m/bt709/bt470m), 1920x1080, 35352 kb/s, 50 fps, 50 tbr, 50k tbn, 100 tbc
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(eng): Audio: pcm_s16le (sowt / 0x74776F73), 48000 Hz, stereo, s16, 1536 kb/s
  
      Metadata:
  
        handler_name    : SoundHandler
  
  Output #0, mov, to 'temp.MOV':
  
    Metadata:
  
      encoder         : Lavf58.20.100
  
      Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuvj420p(pc, smpte170m/bt709/bt470m), 1920x1080, q=2-31, 35352 kb/s, 50 fps, 50 tbr, 50k tbn, 50k tbc
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(eng): Audio: pcm_s16le (sowt / 0x74776F73), 48000 Hz, stereo, s16, 1536 kb/s
  
      Metadata:
  
        handler_name    : SoundHandler
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
    Stream #0:1 -> #0:1 (copy)
  
  Press [q] to stop, [?] for help
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7f82dd802200] st: 0 edit list: 1 Missing key frame while searching for timestamp: 1000
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7f82dd802200] st: 0 edit list 1 Cannot find an index entry before timestamp: 1000.
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7f82dd802200] Auto-inserting h264_mp4toannexb bitstream filter
  
  frame=41886 fps=547 q=-1.0 Lsize= 3789826kB time=00:13:58.75 bitrate=37014.8kbits/s speed=10.9x    
  
  video:3631879kB audio:157123kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.021759%

  Update (1 July 2019)

  I thought that the files had a problem at the beginning or at the end, so I
  trimmed one second from each end, but it still had the sound out of sync :

  FILES=files_to_combine
  
  OUTPUT=show2.MOV
  
  rm $FILES
  
  for i in 3 4 5 6 7 8 9; do
  
      rm ${i}.MOV
  
      duration=$(ffprobe -v 0 -show_entries format=duration -of compact=p=0:nk=1  DSC_001${i}.MOV)
  
      trimmed=$(echo $duration - 1 | bc)
  
      ffmpeg -ss 1 -t $trimmed -i DSC_001${i}.MOV -vcodec copy -acodec copy ${i}.MOV
  
      echo file ./${i}.MOV >> $FILES
  
  done
  
  
  
  rm $OUTPUT
  
  ffmpeg -safe 0 -f concat -i $FILES -vcodec copy -acodec copy $OUTPUT

  When I trim a single file near the end, the sound and video do not seem out of sync :

  ffmpeg -ss 00:09:20 -t 20 -i DSC_0014.MOV -vcodec copy -acodec copy end.MOV

  When I concatenate only 30 seconds from each video, the result seems OK :

  FILES=files_to_combine
  
  OUTPUT=show2.MOV
  
  rm $FILES
  
  for i in 3 4 5 6 7 8 9; do
  
      rm ${i}.MOV
  
      duration=$(ffprobe -v 0 -show_entries format=duration -of compact=p=0:nk=1  DSC_001${i}.MOV)
  
      start=$(echo $duration - 30 | bc)
  
      end=$(echo $duration - 1 | bc)
  
      ffmpeg -ss $start -t $end -i DSC_001${i}.MOV -vcodec copy -acodec copy ${i}.MOV
  
      echo file ./${i}.MOV >> $FILES
  
  done
  
  
  
  rm $OUTPUT
  
  ffmpeg -safe 0 -f concat -i $FILES -vcodec copy -acodec copy $OUTPUT

  This last concatenation gives this error multiple times :

  [mov @ 0x7fc3c7837400] Non-monotonous DTS in output stream 0:0; previous: 9080205, current: 9080200; changing to 9080206. This may result in incorrect timestamps in the output file.

  So I am guessing that the problem is small differences in timestamps that
  accumulate and become more noticeable with longer durations and the
  concatenation of multiple files.

  For reference, the DSLR that shot these clips is a Nikon D3300 and the result
  of ffprobe on one of the files is :

  $ ffprobe DSC_0017.MOV -hide_banner
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fab70003800] st: 0 edit list: 1 Missing key frame while searching for timestamp: 1000
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fab70003800] st: 0 edit list 1 Cannot find an index entry before timestamp: 1000.
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'DSC_0017.MOV':
  
    Metadata:
  
      major_brand     : qt  
  
      minor_version   : 537331968
  
      compatible_brands: qt  niko
  
      creation_time   : 2019-06-12T23:52:37.000000Z
  
    Duration: 00:09:53.58, start: 0.000000, bitrate: 36843 kb/s
  
      Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuvj420p(pc, smpte170m/bt709/bt470m), 1920x1080, 35300 kb/s, 50 fps, 50 tbr, 50k tbn, 100 tbc (default)
  
      Metadata:
  
        creation_time   : 2019-06-12T23:52:37.000000Z
  
      Stream #0:1(eng): Audio: pcm_s16le (sowt / 0x74776F73), 48000 Hz, 2 channels, s16, 1536 kb/s (default)
  
      Metadata:
  
        creation_time   : 2019-06-12T23:52:37.000000Z

  Update (9 August 2019)

  I concatenated the files in iMovie and the sound and image are not as out of sync as with FFMPEG. Maybe iMovie aligns the timestamps at the end of each clip instead of concatenating the audio and image streams separately.

  I ran the concatenation again with the latest ffmpeg 4.1.4_1 on these files and others from the same camera. The audio and image are in sync in one case (the results lasts 46 minutes) out of sync in another (the result lasts 48 minutes).

• Anomalie #3554 (Fermé) : Espace privé : le moteur de recherche ne retrouve pas les articles sur un...

  25 septembre 2015

  suite à http://forum.spip.net/fr_262506.html

  si un article possède un titre du type "vive mai 1968"
  la recherche dans le partie privée sur "1968" ne renvoie rien
  la rceherche dans la partie publique fonctionne sans problème.

  je reproduis en 3.0.20 et 3.1 dev

• Replace lena.pnm

  27 novembre 2014, par Reinhard Tartler

  Replace lena.pnm
  The new reference.pnm is a freely licensed replacement. The photo has
  
  been taken by Reinhard Tartler on August 28 2014, and is licensed under
  
  the expat license as stated at http://www.jclark.com/xml/copying.txt
  

  • [DBH] tests/Makefile
  • [DBH] tests/lena.pnm
  • [DBH] tests/ref/seek/vsynth2-asv1
  • [DBH] tests/ref/seek/vsynth2-asv2
  • [DBH] tests/ref/seek/vsynth2-ffv1
  • [DBH] tests/ref/seek/vsynth2-flashsv
  • [DBH] tests/ref/seek/vsynth2-flv
  • [DBH] tests/ref/seek/vsynth2-h261
  • [DBH] tests/ref/seek/vsynth2-h263
  • [DBH] tests/ref/seek/vsynth2-h263p
  • [DBH] tests/ref/seek/vsynth2-huffyuv
  • [DBH] tests/ref/seek/vsynth2-jpegls
  • [DBH] tests/ref/seek/vsynth2-ljpeg
  • [DBH] tests/ref/seek/vsynth2-mjpeg
  • [DBH] tests/ref/seek/vsynth2-mpeg1
  • [DBH] tests/ref/seek/vsynth2-mpeg1b
  • [DBH] tests/ref/seek/vsynth2-mpeg2-422
  • [DBH] tests/ref/seek/vsynth2-mpeg2-idct-int
  • [DBH] tests/ref/seek/vsynth2-mpeg2-ilace
  • [DBH] tests/ref/seek/vsynth2-mpeg2-ivlc-qprd
  • [DBH] tests/ref/seek/vsynth2-mpeg2-thread
  • [DBH] tests/ref/seek/vsynth2-mpeg2-thread-ivlc
  • [DBH] tests/ref/seek/vsynth2-mpeg4
  • [DBH] tests/ref/seek/vsynth2-mpeg4-adap
  • [DBH] tests/ref/seek/vsynth2-mpeg4-adv
  • [DBH] tests/ref/seek/vsynth2-mpeg4-error
  • [DBH] tests/ref/seek/vsynth2-mpeg4-nr
  • [DBH] tests/ref/seek/vsynth2-mpeg4-qpel
  • [DBH] tests/ref/seek/vsynth2-mpeg4-qprd
  • [DBH] tests/ref/seek/vsynth2-mpeg4-rc
  • [DBH] tests/ref/seek/vsynth2-mpeg4-thread
  • [DBH] tests/ref/seek/vsynth2-msmpeg4
  • [DBH] tests/ref/seek/vsynth2-msmpeg4v2
  • [DBH] tests/ref/seek/vsynth2-roqvideo
  • [DBH] tests/ref/seek/vsynth2-rv10
  • [DBH] tests/ref/seek/vsynth2-rv20
  • [DBH] tests/ref/seek/vsynth2-svq1
  • [DBH] tests/ref/seek/vsynth2-wmv1
  • [DBH] tests/ref/seek/vsynth2-wmv2
  • [DBH] tests/ref/vsynth/vsynth2-asv1
  • [DBH] tests/ref/vsynth/vsynth2-asv2
  • [DBH] tests/ref/vsynth/vsynth2-cljr
  • [DBH] tests/ref/vsynth/vsynth2-dnxhd-1080i
  • [DBH] tests/ref/vsynth/vsynth2-dnxhd-720p
  • [DBH] tests/ref/vsynth/vsynth2-dnxhd-720p-10bit
  • [DBH] tests/ref/vsynth/vsynth2-dnxhd-720p-rd
  • [DBH] tests/ref/vsynth/vsynth2-dv
  • [DBH] tests/ref/vsynth/vsynth2-dv-411
  • [DBH] tests/ref/vsynth/vsynth2-dv-50
  • [DBH] tests/ref/vsynth/vsynth2-ffv1
  • [DBH] tests/ref/vsynth/vsynth2-ffvhuff
  • [DBH] tests/ref/vsynth/vsynth2-flashsv
  • [DBH] tests/ref/vsynth/vsynth2-flv
  • [DBH] tests/ref/vsynth/vsynth2-h261
  • [DBH] tests/ref/vsynth/vsynth2-h263
  • [DBH] tests/ref/vsynth/vsynth2-h263-obmc
  • [DBH] tests/ref/vsynth/vsynth2-h263p
  • [DBH] tests/ref/vsynth/vsynth2-huffyuv
  • [DBH] tests/ref/vsynth/vsynth2-jpegls
  • [DBH] tests/ref/vsynth/vsynth2-ljpeg
  • [DBH] tests/ref/vsynth/vsynth2-mjpeg
  • [DBH] tests/ref/vsynth/vsynth2-mpeg1
  • [DBH] tests/ref/vsynth/vsynth2-mpeg1b
  • [DBH] tests/ref/vsynth/vsynth2-mpeg2
  • [DBH] tests/ref/vsynth/vsynth2-mpeg2-422
  • [DBH] tests/ref/vsynth/vsynth2-mpeg2-idct-int
  • [DBH] tests/ref/vsynth/vsynth2-mpeg2-ilace
  • [DBH] tests/ref/vsynth/vsynth2-mpeg2-ivlc-qprd
  • [DBH] tests/ref/vsynth/vsynth2-mpeg2-thread
  • [DBH] tests/ref/vsynth/vsynth2-mpeg2-thread-ivlc
  • [DBH] tests/ref/vsynth/vsynth2-mpeg4
  • [DBH] tests/ref/vsynth/vsynth2-mpeg4-adap
  • [DBH] tests/ref/vsynth/vsynth2-mpeg4-adv
  • [DBH] tests/ref/vsynth/vsynth2-mpeg4-error
  • [DBH] tests/ref/vsynth/vsynth2-mpeg4-nr
  • [DBH] tests/ref/vsynth/vsynth2-mpeg4-qpel
  • [DBH] tests/ref/vsynth/vsynth2-mpeg4-qprd
  • [DBH] tests/ref/vsynth/vsynth2-mpeg4-rc
  • [DBH] tests/ref/vsynth/vsynth2-mpeg4-thread
  • [DBH] tests/ref/vsynth/vsynth2-msmpeg4
  • [DBH] tests/ref/vsynth/vsynth2-msmpeg4v2
  • [DBH] tests/ref/vsynth/vsynth2-prores
  • [DBH] tests/ref/vsynth/vsynth2-qtrle
  • [DBH] tests/ref/vsynth/vsynth2-rgb
  • [DBH] tests/ref/vsynth/vsynth2-roqvideo
  • [DBH] tests/ref/vsynth/vsynth2-rv10
  • [DBH] tests/ref/vsynth/vsynth2-rv20
  • [DBH] tests/ref/vsynth/vsynth2-svq1
  • [DBH] tests/ref/vsynth/vsynth2-v210
  • [DBH] tests/ref/vsynth/vsynth2-wmv1
  • [DBH] tests/ref/vsynth/vsynth2-wmv2
  • [DBH] tests/ref/vsynth/vsynth2-yuv
  • [DBH] tests/reference.pnm