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• ffmpeg : save separate frames as still gifs

  7 novembre 2013, par Eugene M

  The question is simple : I don't want ffmpeg to create an animated GIF from given video stream, I want separate frames, each in GIF format. But when I set output file to something like frame%09d.gif ffmpeg tends to create an animation (and stores it exactly as frame%09d.gif). The same for -f gif option.

  Of course, I could save PNGs and use ImageMagic's convert utility to transform them to GIFs, but I don't want any additional invocation overhead because I'm dealing with live streams and going to crunch large amounts of data.

  Here is what I do, nothing special :

  ffmpeg -i http://brightcove03-f.akamaihd.net/valgbodmandag1378107345_1_300k@80362 -f gif -y frame_%09d.gif
  
  
  
  ffmpeg version N-54643-g15cee5e Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Jul 11 2013 03:35:11 with gcc 4.7.3 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnu
  
  tls --enable-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetype --enable-libgsm --enable-libilbc --enable-libmodplug --ena
  
  ble-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger -
  
  -enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-lib
  
  vpx --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib
  
    libavutil      52. 39.100 / 52. 39.100
  
    libavcodec     55. 18.102 / 55. 18.102
  
    libavformat    55. 12.101 / 55. 12.101
  
    libavdevice    55.  3.100 / 55.  3.100
  
    libavfilter     3. 80.100 /  3. 80.100
  
    libswscale      2.  3.100 /  2.  3.100
  
    libswresample   0. 17.102 /  0. 17.102
  
    libpostproc    52.  3.100 / 52.  3.100
  
  [flv @ 00000000002cb700] Stream discovered after head already parsed
  
  Input #0, flv, from 'http://brightcove03-f.akamaihd.net/valgbodmandag1378107345_1_300k@80362':
  
    Metadata:
  
      encoder         : Lavf54.6.100
  
    Duration: 00:00:00.00, start: 0.000000, bitrate: N/A
  
      Stream #0:0: Video: h264 (Constrained Baseline), yuv420p, 480x270 [SAR 1:1 DAR 16:9], 25 tbr, 1k tbn, 50 tbc
  
      Stream #0:1: Audio: aac, 44100 Hz, stereo, fltp, 128 kb/s
  
      Stream #0:2: Data: none
  
  [swscaler @ 0000000004d051e0] No accelerated colorspace conversion found from yuv420p to bgr8.
  
  Output #0, gif, to 'frame_%09d.gif':
  
    Metadata:
  
      encoder         : Lavf55.12.101
  
      Stream #0:0: Video: gif, bgr8, 480x270 [SAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 100 tbn, 25 tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 -> gif)
  
  Press [q] to stop, [?] for help
  
  frame=  141 fps=130 q=-1.0 Lsize=    4960kB time=00:00:05.68 bitrate=7153.1kbits/s
  
  video:5100kB audio:0kB subtitle:0 global headers:0kB muxing overhead -2.743247%

  After all I get a file named "frame_%03d.gif", but instead I want to have several files "frame_001.gif", "frame_002.gif", etc.

  Any ideas ?
  Thanks in advance.

• FFMpeg/video4linux2,v4l2 : The v4l2 frame is 46448 bytes, but 153600 bytes are expected (Webcam capture not fast enough ?)

  30 août 2013, par user763410

  I am trying to capture webcam output in linux/ubuntu. I have a chicony webcam (lenovo laptop). I am running inside a VMWARE virtual machine. The capture is not proceeding beyond 10 seconds. can you please help.

  The command I used is :

  $ ffmpeg -y  -f video4linux2 -r 20 -s 160x120 -i /dev/video0 -acodec libfaac -ab 128k  /tmp/web.avi

  The most important message I am getting is :

  [video4linux2,v4l2 @ 0x9e43fa0] The v4l2 frame is 46448 bytes, but 153600 bytes are expected

  Complete message from ffmpeg :

  ffmpeg version N-55159-gf118b41 Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Aug 18 2013 09:09:13 with gcc 4.6 (Ubuntu/Linaro 4.6.3-1ubuntu5)
  
    configuration: --enable-libass --prefix=/opt/ffmpeg --enable-debug --enable-libfreetype
  
    libavutil      52. 40.100 / 52. 40.100
  
    libavcodec     55. 19.100 / 55. 19.100
  
    libavformat    55. 12.102 / 55. 12.102
  
    libavdevice    55.  3.100 / 55.  3.100
  
    libavfilter     3. 82.100 /  3. 82.100
  
    libswscale      2.  4.100 /  2.  4.100
  
    libswresample   0. 17.103 /  0. 17.103
  
  [video4linux2,v4l2 @ 0x9e43fa0] The V4L2 driver changed the video from 160x120 to 320x240
  
  [video4linux2,v4l2 @ 0x9e43fa0] The driver changed the time per frame from 1/20 to 1/15
  
  Input #0, video4linux2,v4l2, from '/dev/video0':
  
    Duration: N/A, start: 6424.338678, bitrate: 18432 kb/s
  
      Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 320x240, 18432 kb/s, 15 fps, 15 tbr, 1000k tbn, 1000k tbc
  
  Codec AVOption ab (set bitrate (in bits/s)) specified for output file #0 (/tmp/web.avi) has not been used for any stream. The most likely reason is either wrong type (e.g. a video option with no video streams) or that it is a private option of some encoder which was not actually used for any stream.
  
  Output #0, avi, to '/tmp/web.avi':
  
    Metadata:
  
      ISFT            : Lavf55.12.102
  
      Stream #0:0: Video: mpeg4 (FMP4 / 0x34504D46), yuv420p, 320x240, q=2-31, 200 kb/s, 20 tbn, 20 tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (rawvideo -> mpeg4)
  
  Press [q] to stop, [?] for help
  
  [video4linux2,v4l2 @ 0x9e43fa0] The v4l2 frame is 46448 bytes, but 153600 bytes are expected
  
  /dev/video0: Invalid data found when processing input
  
  frame=   29 fps= 14 q=3.5 Lsize=      87kB time=00:00:01.45 bitrate= 490.0kbits/s    
  
  video:80kB audio:0kB subtitle:0 global headers:0kB muxing overhead 7.760075%
  
  [video4linux2,v4l2 @ 0x9e43fa0] Some buffers are still owned by the caller on close.

• Concatenating video files with ffmpeg, no sound in output file [on hold]

  1er septembre 2013, par Junaid

  I am concatenating different AVI video files. The input files has been specified in input.txt in the order required. First video file does not have sound track, but subsequent files have.

  After completion the resulting the operation, the output does not have audio !

  If I remove first video files from input then resulting video gets sound. So it means the output format follows the first item in input list. How can I solve this problem.

  Please suggest the options in ffmpeg ; not in any other tools like mencoder.

   ffmpeg -f concat -i inputs.txt -c copy test.avi
  
  ffmpeg version 1.1.git Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Jun 27 2013 09:22:45 with gcc 4.7 (Ubuntu/Linaro 4.7.3-1ubuntu1)
  
    configuration: --prefix=/home/junaid/ffmpeg_build --extra-cflags=-I/home/junaid/ffmpeg_build/include --extra-ldflags=-L/home/junaid/ffmpeg_build/lib --bindir=/home/junaid/bin --extra-libs=-ldl --enable-gpl --enable-libass --enable-libfdk-aac --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-nonfree --enable-x11grab
  
    libavutil      52. 37.101 / 52. 37.101
  
    libavcodec     55. 17.100 / 55. 17.100
  
    libavformat    55.  9.100 / 55.  9.100
  
    libavdevice    55.  2.100 / 55.  2.100
  
    libavfilter     3. 77.101 /  3. 77.101
  
    libswscale      2.  3.100 /  2.  3.100
  
    libswresample   0. 17.102 /  0. 17.102
  
    libpostproc    52.  3.100 / 52.  3.100
  
  [concat @ 0x335a880] Invalid stream index 1
  
  [concat @ 0x335a880] max_analyze_duration 5000000 reached at 5000000 microseconds
  
  Input #0, concat, from 'inputs.txt':
  
    Duration: N/A, bitrate: N/A
  
      Stream #0:0: Video: mpeg4 (Advanced Simple Profile) (xvid / 0x64697678), yuv420p, 720x480 [SAR 32:27 DAR 16:9], 25 fps, 25 tbr, 25 tbn, 25 tbc
  
  Output #0, avi, to 'test.avi':
  
    Metadata:
  
      ISFT            : Lavf55.9.100
  
      Stream #0:0: Video: mpeg4 (xvid / 0x64697678), yuv420p, 720x480 [SAR 32:27 DAR 16:9], q=2-31, 25 fps, 25 tbn, 25 tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
  Press [q] to stop, [?] for help
  
  [concat @ 0x335a880] Invalid stream index 1
  
      Last message repeated 6368 times
  
  frame= 3793 fps=0.0 q=-1.0 size=   11108kB time=00:02:37.96 bitrate= 576.1kbits/Invalid stream index 1
  
  [concat @ 0x335a880] Invalid stream index 1
  
      Last message repeated 7173 times
  
  frame= 7921 fps=7801 q=-1.0 size=   22928kB time=00:05:30.16 bitrate= 568.9kbitsInvalid stream index 1
  
  [concat @ 0x335a880] Invalid stream index 1
  
      Last message repeated 6614 times
  
  frame=11729 fps=7688 q=-1.0 size=   27057kB time=00:08:08.96 bitrate= 453.3kbitsInvalid stream index 1
  
  [concat @ 0x335a880] Invalid stream index 1
  
      Last message repeated 6247 times
  
  frame=15324 fps=7565 q=-1.0 size=   44956kB time=00:10:38.92 bitrate= 576.4kbitsInvalid stream index 1
  
  [concat @ 0x335a880] Invalid stream index 1
  
      Last message repeated 6553 times
  
  frame=19096 fps=7516 q=-1.0 size=   64014kB time=00:13:16.24 bitrate= 658.6kbitsInvalid stream index 1
  
  [concat @ 0x335a880] Invalid stream index 1
  
      Last message repeated 6753 times
  
  frame=22983 fps=7558 q=-1.0 size=   79848kB time=00:15:58.36 bitrate= 682.5kbitsInvalid stream index 1
  
  [concat @ 0x335a880] Invalid stream index 1
  
      Last message repeated 7011 times
  
  frame=27019 fps=7610 q=-1.0 size=   94130kB time=00:18:46.68 bitrate= 684.4kbitsInvalid stream index 1
  
  [concat @ 0x335a880] Invalid stream index 1
  
      Last message repeated 1302 times
  
  frame=27772 fps=7658 q=-1.0 Lsize=   96618kB time=00:19:18.08 bitrate= 683.5kbits/s    
  
  video:95921kB audio:0kB subtitle:0 global headers:0kB muxing overhead 0.726908%