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• Convertion of mp3 file with ffmpeg results in a file with wrong length [duplicate]

  16 avril 2018, par Arthur Efixty

  This question already has an answer here :

  • ffmpeg : add subtitles to mp4 with out creating a new file
    
    1 answer
    

  I wrote a simple script for Linux where I loop through the folder (containing only .mp3 files) and add an album art to every item.

  Here is my code :

  for file in ~/Desktop/Rise\ Against/*
  
      do
  
          ffmpeg -i "${file}" -i ~/Desktop/appeal\ to\ reason.jpeg -map 0:0 -map 1:0 -codec copy -id3v2_version 3 \-metadata:s:v title="Album cover" -metadata:s:v comment="Cover (front)" "${file%}";
  
      done

  If I set the output filename to hardcoded value like out.mp3 then it works fine. But I need these files to have the same name as existing and overwrite them.

  Running this script results in having all files edited as expected (the album art changed) but they all have a length of 3 seconds. In terminal I get this [mp3 @ 0xc695e0] Audio packet of size 378219 (starting with 6B0855F2...) is invalid, writing it anyway.

  Thanks in advance !

• asfdec : interpret the first flag in an asf packet as length flag

  24 juillet 2015, par Alexandra Hájková

  asfdec : interpret the first flag in an asf packet as length flag
  if the error correction flag is not set, a packet starts with payload
  Signed-off-by : Anton Khirnov <anton@khirnov.net>
  

  • [DBH] libavformat/asfdec.c

• Ffmpeg video length is not as expected

  29 juin 2016, par Karnivaurus

  I have a folder containing 500 images, of that format image0.png, image1.png, ..., image499.png. I want to use ffmpeg to convert these images to a video with a frame rate of 50. This should meant that the total video duration is 10 seconds (= 500 / 50).

  To do this, I used the following command :

  ffmpeg -r 50 -f image2 -i image%1d.png -vcodec libx264 -crf 15 -pix_fmt yuv420p video.mp4

  However, the video which was created, had a duration of 2.5 seconds. Otherwise, the video displays the images correctly, and runs from the beginning to the end as expected.

  Why is the video length not as I would have expected ?

  ---

  The full output from the console is :

  ffmpeg version 2.7.6-0ubuntu0.15.10.1 Copyright (c) 2000-2016 the FFmpeg developers
  
    built with gcc 5.2.1 (Ubuntu 5.2.1-22ubuntu2) 20151010
  
    configuration: --prefix=/usr --extra-version=0ubuntu0.15.10.1 --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --enable-shared --disable-stripping --enable-avresample --enable-avisynth --enable-frei0r --enable-gnutls --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-openal --enable-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger --enable-libshine --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libxvid --enable-libzvbi --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzmq --enable-libssh --enable-libsoxr --enable-libx264 --enable-libopencv --enable-libx265
  
    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, image2, from 'image%1d.png':
  
    Duration: 00:00:10.00, start: 0.000000, bitrate: N/A
  
      Stream #0:0: Video: png, rgb24(pc), 1600x600, 50 fps, 50 tbr, 50 tbn, 50 tbc
  
  [libx264 @ 0x122c6c0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 AVX2 LZCNT BMI2
  
  [libx264 @ 0x122c6c0] profile High, level 3.2
  
  [libx264 @ 0x122c6c0] 264 - core 146 r2555 0c21480 - H.264/MPEG-4 AVC codec - Copyleft 2003-2015 - 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=12 lookahead_threads=2 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=15.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
  
  Output #0, mp4, to 'video.mp4':
  
    Metadata:
  
      encoder         : Lavf56.36.100
  
      Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 1600x600, q=-1--1, 50 fps, 12800 tbn, 50 tbc
  
      Metadata:
  
        encoder         : Lavc56.41.100 libx264
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (png (native) -> h264 (libx264))
  
  Press [q] to stop, [?] for help
  
  frame=   84 fps=0.0 q=23.0 size=      61kB time=00:00:00.52 bitrate= 962.5kbits/frame=  161 fps=160 q=23.0 size=     216kB time=00:00:02.06 bitrate= 860.6kbits/frame=  236 fps=157 q=23.0 size=     438kB time=00:00:03.56 bitrate=1008.2kbits/frame=  315 fps=157 q=23.0 size=     658kB time=00:00:05.14 bitrate=1048.8kbits/frame=  390 fps=155 q=23.0 size=     850kB time=00:00:06.64 bitrate=1048.7kbits/frame=  461 fps=153 q=23.0 size=    1059kB time=00:00:08.06 bitrate=1076.2kbits/frame=  500 fps=145 q=-1.0 Lsize=    1292kB time=00:00:09.96 bitrate=1062.3kbits/s    
  
  video:1285kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.521096%
  
  [libx264 @ 0x122c6c0] frame I:2     Avg QP: 9.48  size: 11840
  
  [libx264 @ 0x122c6c0] frame P:223   Avg QP:16.74  size:  3729
  
  [libx264 @ 0x122c6c0] frame B:275   Avg QP:21.86  size:  1672
  
  [libx264 @ 0x122c6c0] consecutive B-frames:  1.0% 73.6% 10.2% 15.2%
  
  [libx264 @ 0x122c6c0] mb I  I16..4: 51.2% 40.0%  8.7%
  
  [libx264 @ 0x122c6c0] mb P  I16..4:  0.9%  1.7%  0.4%  P16..4:  6.2%  3.6%  2.1%  0.0%  0.0%    skip:85.0%
  
  [libx264 @ 0x122c6c0] mb B  I16..4:  0.2%  0.3%  0.0%  B16..8:  7.8%  2.9%  0.7%  direct: 0.5%  skip:87.5%  L0:44.4% L1:50.3% BI: 5.3%
  
  [libx264 @ 0x122c6c0] 8x8 transform intra:52.1% inter:38.1%
  
  [libx264 @ 0x122c6c0] coded y,uvDC,uvAC intra: 9.7% 0.0% 0.0% inter: 1.8% 0.0% 0.0%
  
  [libx264 @ 0x122c6c0] i16 v,h,dc,p: 50% 41%  3%  6%
  
  [libx264 @ 0x122c6c0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 44% 12% 36%  2%  1%  1%  1%  4%  0%
  
  [libx264 @ 0x122c6c0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 41% 25% 21%  3%  1%  2%  1%  5%  1%
  
  [libx264 @ 0x122c6c0] i8c dc,h,v,p: 100%  0%  0%  0%
  
  [libx264 @ 0x122c6c0] Weighted P-Frames: Y:0.0% UV:0.0%
  
  [libx264 @ 0x122c6c0] ref P L0: 69.2%  7.5% 16.7%  6.6%
  
  [libx264 @ 0x122c6c0] ref B L0: 78.0% 20.6%  1.4%
  
  [libx264 @ 0x122c6c0] ref B L1: 96.8%  3.2%
  
  [libx264 @ 0x122c6c0] kb/s:1052.00