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• basetime for strftime segment filename template

  12 mai 2015, par basin

  I have a big mp3 file, which I started recording at 17:24. Trying to split into 2 minute segments :

  ffmpeg -y -i test.mp3 -map 0 -c copy -f segment -segment_time 120 -reset_timestamps 1 -strftime 1 '1/test-%H-%M.mp3'

  Need segment names like test-17-24.mp3, test-17-26.mp3, ..., Actual first segment is named as current time, no extra segments created

  $ date
  
  Tue May 12 06:52:04 MSK 2015
  
  $ ffmpeg -y -i test.mp3 -map 0 -c copy -f segment -segment_time 120 -reset_timestamps 1 -strftime 1 '1/test-%H-%M.mp3'
  
  ffmpeg version N-72058-g3ecc063 Copyright (c) 2000-2015 the FFmpeg developers
  
  Input #0, mp3, from 'test.mp3':
  
    Duration: 05:45:05.94, start: 0.000000, bitrate: 171 kb/s
  
      Stream #0:0: Audio: mp3, 48000 Hz, stereo, s16p, 171 kb/s
  
  [segment @ 000000000051d560] Codec for stream 0 does not use global headers but container format requires global headers
  
  Output #0, segment, to '1/test-%H-%M.mp3':
  
    Metadata:
  
      encoder         : Lavf56.33.100
  
      Stream #0:0: Audio: mp3, 48000 Hz, stereo, 171 kb/s
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
  Press [q] to stop, [?] for help
  
  size=N/A time=00:13:07.87 bitrate=N/A
  
  video:0kB audio:16211kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
  
  $ ls 1
  
  test-06-52.mp3
  
  $

• Debugging an MP4 opened by VLC but not by ffplay

  15 mai 2017, par MaMazav

  I’m writing a code which creates MP4 files. To check it I’ve created an MP4 file.

  The file is played correctly by VLC and Firefox, but not by ffplay or by Chrome. I guess the file contains error which VLC can cope with but more aggressive MP4 reader cannot.

  I’ve thought about repairing the file and check what are the differences to fix my code. However I tried some programs to repair MP4 files, without success until now.

  Can someone reccommend another way to debug the problem, or a good tool to fix MP4 files ? The file is a fragmented MP4 contains both the init section (ftyp, moov boxes) and one fragment section (moof and empty sidx).

  Here is the video file :

  https://www.dropbox.com/s/rojxzvkfxfj31u8/400k00001-3_serialized.mp4?dl=0

  EDIT : It doesn’t work also in Firefox, when using Media Source Extensions like in this example :
  http://people.mozilla.org/ jyavenard/tests/mse_mp4/paper.html

  (don’t forget to enable MSE on Firefox, as explained here :
  http://www.linuxveda.com/2015/04/02/enable-mse-native-html5-support-firefox-linux/)

  EDIT2 : In chrome ://media-internals, I see the following error with the above example :
  Append : stream parsing failed. Data size=131072 append_window_start=0 append_window_end=inf

  (Change the URL to be the file and change the codec to be ’avc1.4d401f’ instead of ’avc1.64000d,mp4a.40.2’).

• Convert image sequence to video using ffmpeg and list of files

  13 mai 2015, par rensa

  I have a camera taking time-lapse shots every 2–3 seconds, and I keep a rolling record of a few days’ worth. Because that’s a lot of files, I keep them in subdirectories by day and hour :

  images/
  
      2015-05-02/
  
          00/
  
              2015-05-02-0000-02
  
              2015-05-02-0000-05
  
              2015-05-02-0000-07
  
          01/
  
              (etc.)
  
      2015-05-03/

  I’m writing a script to automatically upload a timelapse of the sunrise to YouTube each day. I can get the sunrise time from the web in advance, then go back after the sunrise and get a list of the files that were taken in that period using find :

  touch -d "$SUNRISE_START" sunrise-start.txt
  
  touch -d "$SUNRISE_END" sunrise-end.txt
  
  find images/"$TODAY" -type f -anewer sunrise-start.txt ! -anewer sunrise-end.txt

  Now I want to convert those files to a video with ffmpeg. Ideally I’d like to do this without making a copy of all the files (because we’re talking 3.5 GB per hour of images), and I’d prefer not to rename them to something like image000n.jpg because other users may want to access the images. Copying the images is my fallback.

  But I’m getting stuck sending the results of find to ffmpeg. I understand that ffmpeg can expand wildcards internally, but I’m not sure that this is going to work where the files aren’t all in one directory. I also see a few people using find’s --exec option with ffmpeg to do batch conversions, but I’m not sure if this is going to work with image sequence input (as opposed to, say, converting 1000 images into 1000 single-frame videos).

  Any ideas on how I can connect the two—or, failing that, a better way to get files in a date range across several subdirectories into ffmpeg as an image sequence ?