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• The final request has incomplete range header while streaming webm using shaka player

  3 mai 2019, par Jane

  I’m streaming a webm file using shaka player.
  While streaming using shaka player the last cluster is not fetched because the range header in the request is in complete. It looks like this :
  range: bytes=9511454-
  What should I change to get a complete range header from shaka player ?

  I followed the procedure shown here for encoding the video and audio files and generating the manifest file. In addition to this, I encoded the video file using ffmpeg before running it through mkvmuxer_sample.

• ffmpeg : video from images - handling a zero length image file

  29 septembre 2021, par Buadhai

  I have a shell script which uses ffmpeg to crate a time-lapse video from webcam images. Normally, it works just fine :

  


  /usr/bin/ffmpeg -loglevel info  -framerate 4 \
     -pattern_type glob -i $ipath/'*.jpg' \
    -c:v libx264 -crf 30 -y -pix_fmt yuv420p $temp &>>$log


  


  But this chokes if the image is a zero-length file :

  


  -rw-r--r-- 1 pi pi  156636 Sep 29 04:35 image_022.jpg
-rw-r--r-- 1 pi pi  156533 Sep 29 04:35 image_023.jpg
-rw-r--r-- 1 pi pi  159302 Sep 29 04:35 image_024.jpg
-rw-r--r-- 1 pi pi       0 Sep 29 04:35 image_025.jpg
-rw-r--r-- 1 pi pi  157055 Sep 29 04:35 image_026.jpg
-rw-r--r-- 1 pi pi  156851 Sep 29 04:35 image_027.jpg
-rw-r--r-- 1 pi pi  155793 Sep 29 04:35 image_028.jpg
-rw-r--r-- 1 pi pi  160647 Sep 29 04:35 image_029.jpg


  


  In this case the video only included frames up to the zero length JPEG.

  


  I realize I can test the file length of every webcam image, but there must be an easier, more efficient way.

  


  Is there ?

  


• How do I copy ALL metadata from flac/mp3 to alac with ffmpeg ? -movflags isn't working, default just copies basic metadata

  24 juillet 2021, par Architekt

  I've spent 2 days now reasearching this and all the info I've found doesn't work. If I do this simple command :

  


  ffmpeg -i test.mp3 -y -vn -c:a alac /storage/test.m4a


  


  it copies the standard tags. The -vn is to disable copying album art, I've given up on that. It's easier to just separately use AtomicParsley to handle it because some of the album art isn't height divisble by 2.

  


  Problem is, I have extra custom tags that I need as well. Not necessarily for this particular track, but for all the vinyl I spent 2 months archiving. I've tried using the -movflags use_metadata_tags option but that didn't do anything. In fact, it completely prevented the copying of any metadata whatsoever. Here's the command I tried :

  


  ffmpeg -i test.mp3 -y -movflags use_metadata_tags -vn -c:a alac /storage/test.m4a


  


  On my Windows machine, if I use Foobar2000 and convert the same file to m4a, it copies ALL metadata, 100% to the resultant m4a file. Sadly, I need to do this from a linux command line, as part of an automation process. Both commands I've tried show output metadata equivalent to the input (sans cover art), so I'm not sure what that's about. In case it helps, here's the full screen output when I use that latter command with the -movflags tag. I'm going to use a pastebin link so as to not clutter this post with the verbose output.

  


  I've tried -map_metadata 0 as well, same results, but that's to be expected as from what I've read that just copies the global/standard tags. This must be possible, otherwise I have no idea how foobar2000 would be able to do it. I'd love to just use that, but alas, as stated, I have to do this on Linux command line for this particular situation.