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• What is wrong with the following ffmpeg command

  9 juin 2017, par Brad

  What is wrong with the following ffmpeg command ? Originally this had -sameq instead of the -qscale:a 0

  Command :

  ffmpeg -loglevel debug -threads 4 -i sample-in.mpg -ss 00:00:01 -t 00:00:05 -f image2 -y sample-frames/frame%d.png -acodec copy -qscale:a 0  -y sample.mp3

  ---

  Output

  ffmpeg version 1.2.1 Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Jul  9 2013 04:36:42 with Apple clang version 4.1 (tags/Apple/clang-421.11.66) (based on LLVM 3.1svn)
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/1.2.1 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-nonfree --enable-hardcoded-tables --enable-avresample --enable-vda --cc=cc --host-cflags= --host-ldflags= --enable-libx264 --enable-libfaac --enable-libmp3lame --enable-libxvid --enable-ffplay
  
    libavutil      52. 18.100 / 52. 18.100
  
    libavcodec     54. 92.100 / 54. 92.100
  
    libavformat    54. 63.104 / 54. 63.104
  
    libavdevice    54.  3.103 / 54.  3.103
  
    libavfilter     3. 42.103 /  3. 42.103
  
    libswscale      2.  2.100 /  2.  2.100
  
    libswresample   0. 17.102 /  0. 17.102
  
    libpostproc    52.  2.100 / 52.  2.100
  
  
  
  Splitting the commandline.
  
  Reading option '-loglevel' ... matched as option 'loglevel' (set libav* logging level) with argument 'debug'.
  
  Reading option '-threads' ... matched as AVOption 'threads' with argument '4'.
  
  Reading option '-i' ... matched as input file with argument 'sample-in.mpg'.
  
  Reading option '-ss' ... matched as option 'ss' (set the start time offset) with argument '00:00:01'.
  
  Reading option '-t' ... matched as option 't' (record or transcode "duration" seconds of audio/video) with argument '00:00:05'.
  
  Reading option '-f' ... matched as option 'f' (force format) with argument 'image2'.
  
  Reading option '-y' ... matched as option 'y' (overwrite output files) with argument '1'.
  
  Reading option 'sample-frames/frame%d.png' ... matched as output file.
  
  Reading option '-acodec' ... matched as option 'acodec' (force audio codec ('copy' to copy stream)) with argument 'copy'.
  
  Reading option '-qscale:a' ... matched as option 'qscale' (use fixed quality scale (VBR)) with argument '0'.
  
  Reading option '-y' ... matched as option 'y' (overwrite output files) with argument '1'.
  
  Reading option 'sample.mp3' ... matched as output file.
  
  Finished splitting the commandline.
  
  Parsing a group of options: global .
  
  Applying option loglevel (set libav* logging level) with argument debug.
  
  Applying option y (overwrite output files) with argument 1.
  
      Last message repeated 1 times
  
  Successfully parsed a group of options.
  
  Parsing a group of options: input file sample-in.mpg.
  
  Successfully parsed a group of options.
  
  Opening an input file: sample-in.mpg.
  
  [mpeg @ 0x7ffb4a80f200] Format mpeg probed with size=16384 and score=52
  
  [mpeg @ 0x7ffb4a80f200] File position before avformat_find_stream_info() is 0
  
  [mpeg @ 0x7ffb4a80f200] probing stream 0 pp:2500
  
  [mpeg @ 0x7ffb4a80f200] Probe with size=2002, packets=1 detected mpegvideo with score=25
  
  [mpeg @ 0x7ffb4a80f200] probing stream 0 pp:2499
  
  [mpeg @ 0x7ffb4a80f200] Probe with size=4043, packets=2 detected mpegvideo with score=25
  
  [mpeg @ 0x7ffb4a80f200] probing stream 0 pp:2498
  
  [mpeg @ 0x7ffb4a80f200] Probe with size=6084, packets=3 detected mpegvideo with score=25
  
  [mpeg @ 0x7ffb4a80f200] probing stream 0 pp:2497
  
  [mpeg @ 0x7ffb4a80f200] probing stream 0 pp:2496
  
  [mpeg @ 0x7ffb4a80f200] Probe with size=10166, packets=5 detected mpegvideo with score=25
  
  [mpeg @ 0x7ffb4a80f200] probing stream 0 pp:2495
  
  [mpeg @ 0x7ffb4a80f200] probing stream 0 pp:2494
  
  [mpeg @ 0x7ffb4a80f200] probing stream 0 pp:2493
  
  [mpeg @ 0x7ffb4a80f200] probing stream 0 pp:2492
  
  [mpeg @ 0x7ffb4a80f200] Probe with size=18330, packets=9 detected mpegvideo with score=25
  
  [mpeg @ 0x7ffb4a80f200] probing stream 0 pp:2491
  
  [mpeg @ 0x7ffb4a80f200] probing stream 0 pp:2490
  
  [mpeg @ 0x7ffb4a80f200] probing stream 0 pp:2489
  
  [mpeg @ 0x7ffb4a80f200] probing stream 0 pp:2488
  
  [mpeg @ 0x7ffb4a80f200] probing stream 0 pp:2487
  
  [mpeg @ 0x7ffb4a80f200] probing stream 0 pp:2486
  
  [mpeg @ 0x7ffb4a80f200] probing stream 0 pp:2485
  
  [mpeg @ 0x7ffb4a80f200] probing stream 0 pp:2484
  
  [mpeg @ 0x7ffb4a80f200] Probe with size=34658, packets=17 detected mpegvideo with score=25
  
  [mpeg @ 0x7ffb4a80f200] probing stream 0 pp:2483
  
  [mpeg @ 0x7ffb4a80f200] probing stream 0 pp:2482
  
  [mpeg @ 0x7ffb4a80f200] probing stream 0 pp:2481
  
  [mpeg @ 0x7ffb4a80f200] probing stream 0 pp:2480
  
  [mpeg @ 0x7ffb4a80f200] probing stream 0 pp:2479
  
  [mpeg @ 0x7ffb4a80f200] probing stream 0 pp:2478
  
  [mpeg @ 0x7ffb4a80f200] probing stream 0 pp:2477
  
  [mpeg @ 0x7ffb4a80f200] probing stream 0 pp:2476
  
  [mpeg @ 0x7ffb4a80f200] probing stream 0 pp:2475
  
  [mpeg @ 0x7ffb4a80f200] probing stream 0 pp:2474
  
  [mpeg @ 0x7ffb4a80f200] probing stream 0 pp:2473
  
  [mpeg @ 0x7ffb4a80f200] probing stream 0 pp:2472
  
  [mpeg @ 0x7ffb4a80f200] probing stream 0 pp:2471
  
  [mpeg @ 0x7ffb4a80f200] probing stream 0 pp:2470
  
  [mpeg @ 0x7ffb4a80f200] probing stream 0 pp:2469
  
  [mpeg @ 0x7ffb4a80f200] probing stream 0 pp:2468
  
  [mpeg @ 0x7ffb4a80f200] Probe with size=67266, packets=33 detected mpegvideo with score=51
  
  [mpeg @ 0x7ffb4a80f200] probed stream 0
  
  [mpeg @ 0x7ffb4a80f200] first_dts 86997 not matching first dts 93003 in the queue
  
      Last message repeated 3 times
  
  [mpeg @ 0x7ffb4a80f200] first_dts 86997 not matching first dts 108018 in the queue
  
      Last message repeated 3 times
  
  [mpeg @ 0x7ffb4a80f200] first_dts 90000 not matching first dts 111600 in the queue
  
      Last message repeated 9 times
  
  [mpeg @ 0x7ffb4a80f200] first_dts 90000 not matching first dts 135360 in the queue
  
      Last message repeated 8 times
  
  [mpeg @ 0x7ffb4a80f200] first_dts 90000 not matching first dts 156960 in the queue
  
      Last message repeated 9 times
  
  [mpeg @ 0x7ffb4a80f200] first_dts 90000 not matching first dts 180720 in the queue
  
      Last message repeated 8 times
  
  [mpeg @ 0x7ffb4a80f200] first_dts 90000 not matching first dts 202320 in the queue
  
      Last message repeated 9 times
  
  [mpeg @ 0x7ffb4a80f200] first_dts 90000 not matching first dts 226080 in the queue
  
      Last message repeated 8 times
  
  [mpeg @ 0x7ffb4a80f200] first_dts 90000 not matching first dts 247680 in the queue
  
      Last message repeated 9 times
  
  [mpeg @ 0x7ffb4a80f200] first_dts 90000 not matching first dts 271440 in the queue
  
      Last message repeated 9 times
  
  [mpeg @ 0x7ffb4a80f200] first_dts 90000 not matching first dts 295200 in the queue
  
      Last message repeated 8 times
  
  [mpeg @ 0x7ffb4a80f200] first_dts 90000 not matching first dts 316800 in the queue
  
      Last message repeated 9 times
  
  [mpeg @ 0x7ffb4a80f200] first_dts 90000 not matching first dts 340560 in the queue
  
      Last message repeated 8 times
  
  [mpeg @ 0x7ffb4a80f200] first_dts 90000 not matching first dts 362160 in the queue
  
      Last message repeated 9 times
  
  [mpeg @ 0x7ffb4a80f200] first_dts 90000 not matching first dts 385920 in the queue
  
      Last message repeated 8 times
  
  [mpeg @ 0x7ffb4a80f200] first_dts 90000 not matching first dts 407520 in the queue
  
      Last message repeated 9 times
  
  [mpeg @ 0x7ffb4a80f200] first_dts 90000 not matching first dts 431280 in the queue
  
      Last message repeated 8 times
  
  [mpeg @ 0x7ffb4a80f200] first_dts 90000 not matching first dts 452880 in the queue
  
      Last message repeated 9 times
  
  [mpeg @ 0x7ffb4a80f200] first_dts 90000 not matching first dts 476640 in the queue
  
      Last message repeated 8 times
  
  [mpeg @ 0x7ffb4a80f200] first_dts 90000 not matching first dts 498240 in the queue
  
      Last message repeated 9 times
  
  [mpeg @ 0x7ffb4a80f200] first_dts 90000 not matching first dts 522000 in the queue
  
      Last message repeated 9 times
  
  [mpeg @ 0x7ffb4a80f200] max_analyze_duration 5000000 reached at 5005000 microseconds
  
  [mpeg @ 0x7ffb4a80f200] File position after avformat_find_stream_info() is 0
  
  Input #0, mpeg, from 'sample-in.mpg':
  
    Duration: 00:00:05.97, start: 1.000000, bitrate: 6827 kb/s
  
      Stream #0:0[0x1e0], 152, 1/90000: Video: mpeg1video, yuv420p, 704x480 [SAR 200:219 DAR 880:657], 1001/30000, 104857 kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 29.97 tbc
  
      Stream #0:1[0x1c0], 211, 1/90000: Audio: mp2, 48000 Hz, stereo, s16p, 64 kb/s
  
  Successfully opened the file.
  
  Parsing a group of options: output file sample-frames/frame%d.png.
  
  Applying option ss (set the start time offset) with argument 00:00:01.
  
  Applying option t (record or transcode "duration" seconds of audio/video) with argument 00:00:05.
  
  Applying option f (force format) with argument image2.
  
  Successfully parsed a group of options.
  
  Opening an output file: sample-frames/frame%d.png.
  
  Successfully opened the file.
  
  Parsing a group of options: output file sample.mp3.
  
  Applying option acodec (force audio codec ('copy' to copy stream)) with argument copy.
  
  Applying option qscale:a (use fixed quality scale (VBR)) with argument 0.
  
  Successfully parsed a group of options.
  
  Opening an output file: sample.mp3.
  
  Successfully opened the file.
  
  [buffer @ 0x7ffb4a411e40] Setting entry with key 'video_size' to value '704x480'
  
  [buffer @ 0x7ffb4a411e40] Setting entry with key 'pix_fmt' to value '0'
  
  [buffer @ 0x7ffb4a411e40] Setting entry with key 'time_base' to value '1/90000'
  
  [buffer @ 0x7ffb4a411e40] Setting entry with key 'pixel_aspect' to value '200/219'
  
  [buffer @ 0x7ffb4a411e40] Setting entry with key 'sws_param' to value 'flags=2'
  
  [buffer @ 0x7ffb4a411e40] Setting entry with key 'frame_rate' to value '30000/1001'
  
  [graph 0 input from stream 0:0 @ 0x7ffb4a411de0] w:704 h:480 pixfmt:yuv420p tb:1/90000 fr:30000/1001 sar:200/219 sws_param:flags=2
  
  [scale @ 0x7ffb4a414800] Setting 'w' to value '0'
  
  [scale @ 0x7ffb4a414800] Setting 'h' to value '0'
  
  [scale @ 0x7ffb4a414800] Setting 'flags' to value '0x4'
  
  [auto-inserted scaler 0 @ 0x7ffb4a414740] w:0 h:0 flags:'0x4' interl:0
  
  [format @ 0x7ffb4a42aa20] auto-inserting filter 'auto-inserted scaler 0' between the filter 'Parsed_null_0' and the filter 'format'
  
  [auto-inserted scaler 0 @ 0x7ffb4a414740] picking rgb24 out of 7 ref:yuv420p alpha:0
  
  [auto-inserted scaler 0 @ 0x7ffb4a414740] w:704 h:480 fmt:yuv420p sar:200/219 -> w:704 h:480 fmt:rgb24 sar:200/219 flags:0x4
  
  [png @ 0x7ffb4a831000] detected 4 logical cores
  
  [mp3 @ 0x7ffb4a831600] Invalid audio stream. Exactly one MP3 audio stream is required.
  
  Output #0, image2, to 'sample-frames/frame%d.png':
  
    Metadata:
  
      encoder         : Lavf54.63.104
  
      Stream #0:0, 0, 1/90000: Video: png, rgb24, 704x480 [SAR 200:219 DAR 880:657], 1001/30000, q=2-31, 200 kb/s, 90k tbn, 29.97 tbc
  
  Output #1, mp3, to 'sample.mp3':
  
    Metadata:
  
      encoder         : Lavf54.63.104
  
      Stream #1:0, 0, 1/90000: Audio: mp2, 48000 Hz, stereo, 64 kb/s
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (mpeg1video -> png)
  
    Stream #0:1 -> #1:0 (copy)
  
  Could not write header for output file #1 (incorrect codec parameters ?): Invalid argument
  
  Statistics: 4542608 bytes read, 2 seeks

  I found the code above from : http://kwlug.org/node/854
  I did a few edits removing the -sameq and replacing it with -qscale:a 0 which probably is wrong.

• How to split multiple audio files by 10 seconds each on OSX ?

  23 juin 2020, par LA_

  Let's say I have 100 audio files and I would like to split each file into several files with 10 seconds length.

  


  I think the following should work :

  


  for i in *.ogg; do
  echo -n $i ...
  ffmpeg -i $i.ogg -ss 0  -t 10 $i_1.ogg
  ffmpeg -i $i.ogg -ss 10 -t 10 $i_2.ogg
  ffmpeg -i $i.ogg -ss 20 -t 10 $i_3.ogg
done


  


  But I don't understand how many times ffmpeg commands should be repeated.

  


• ffmpeg decode video to YUV and damaged pixels

  28 août 2021, par user3807476

  I use this example to decode a mpeg1 video

  


  when decode starts

  


  log (every 3 to 10 frames) :

  


  [mpeg1video @ 0x5626caf74e40] ac-tex damaged at 39 15
[mpeg1video @ 0x5626caf74e40] Warning MVs not available
[mpeg1video @ 0x5626caf74e40] concealing 405 DC, 405 AC, 405 MV errors in P frame


  


  and the result is :

  


  

  


  I tried make rgb from YUV using opencv but the rgb results is same

  


      cv::Size actual_size(frame->width, frame->height);
    cv::Size half_size(frame->width/2, frame->height/2);
    cv::Mat y(actual_size, CV_8UC1, frame->data[0]);
    cv::Mat u(half_size, CV_8UC1, frame->data[1]);
    cv::Mat v(half_size, CV_8UC1, frame->data[2]);

    cv::Mat u_resized, v_resized;
    cv::resize(u, u_resized, actual_size, 0, 0, cv::INTER_NEAREST); //repeat u values 4 times
    cv::resize(v, v_resized, actual_size, 0, 0, cv::INTER_NEAREST); //repeat v values 4 times

    cv::Mat yuv; 
    std::vector yuv_channels = { y, u_resized, v_resized };
    cv::merge(yuv_channels, yuv);

    cv::Mat bgr;
    cv::cvtColor(yuv, bgr, cv::COLOR_YUV2BGR);
    
    cv::imshow("x",bgr);
    cv::waitKey(1000/25);