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• stream_decoder : Two read_metadata() fixes from 1.2.1 maintenance branch.

  28 juin 2014, par Erik de Castro Lopo

  stream_decoder : Two read_metadata() fixes from 1.2.1 maintenance branch.
  * Fix leaks in read_metadata_() that could occur because of read errors or
  
    malformed streams.
  
      http://flac.cvs.sourceforge.net/viewvc/flac/flac/src/libFLAC/
  
      stream_decoder.c ?
  
      r1=1.147&r2=1.147.2.1&pathrev=FLAC_RELEASE_1_2_1_MAINTENANCE_BRANCH
  * Fix metadata block initialization bug in read_metadata_().
  
      http://flac.cvs.sourceforge.net/viewvc/flac/flac/src/libFLAC/
  
      stream_decoder.c ?
  
      r1=1.147.2.1&r2=1.147.2.2&pathrev=FLAC_RELEASE_1_2_1_MAINTENANCE_BRANCH
  Patch-from : lvqcl <lvqcl.mail@gmail.com>
  

  • [DH] src/libFLAC/stream_decoder.c

• FFMPEG use -strict -2

  21 août 2020, par GILO

  Hi I've been recently using the command below

  


  Ffmpeg -i song.mp3 -loop 1 -i image.jpg -filter_complex \
"[0:a]showfreqs=mode=line:ascale=log:fscale=log:s=1280x518[sf]; \
 [0:a]showwaves=s=1280x202:mode=p2p[sw]; \
 [sf][sw]vstack[fg]; \
 [1:v]scale=1280:-1,crop=iw:720[bg]; \
 [bg][fg]overlay=shortest=1:format=auto,format=yuv420p,drawtext=fontfile=/usr/share/fonts/TTF/Vera.ttf:fontcolor=white:x=10:y=10:text='\"Rated80s Prophets Prey\" by Comics On Film'[out]" \
-map "[out]" -map 0:a -c:v libx264 -preset fast -crf 18 -c:a libopus output.mp4 


  


  from this post Showfreqs and showwaves over background image ?.

  


  


  However I changed the output file to from output.mkv to output.mp4 as I would prefer to use mp4

  


  


  I get the below error

  


  [mp4 @ 0x7f962b816800] opus in MP4 support is experimental, add '-strict -2' if you want to use it.
Could not write header for output file #0 (incorrect codec parameters ?) : Experimental feature
Error initializing output stream 0:0 —
[libopus @ 0x7f962b819800] 1 frames left in the queue on closing

  


  The main information from that error is

  


  


  opus in MP4 support is experimental, add '-strict -2' if you want to use it.

  


  


  but where do I use -strict -2 within the command to make the command possible

  


• ffmpeg can't transcode DVD ac3 audio stream, but VLC can play it

  21 février 2020, par RalphORama

  I’m attempting to transcode a DVD to a single MKV file. I’ve had success in the past with other DVDs, but I’m running into an error I haven’t seen before.

  First I concatenate the VOB files I want to transcode :

  cat VTS_02_1.VOB VTS_02_2.VOB VTS_02_3.VOB > WMAV.VOB

  ffprobe output :

  $ ffprobe -analyzeduration 100M -probesize 100M WMAV.VOB                                                                         Input #0, mpeg, from 'WMAV.VOB':
  
    Duration: 01:05:19.42, start: 0.300300, bitrate: 5686 kb/s
  
      Stream #0:0[0x1bf]: Data: dvd_nav_packet
  
      Stream #0:1[0x1e0]: Video: mpeg2video (Main), yuv420p(tv, smpte170m, top first), 720x480 [SAR 32:27 DAR 16:9], 29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc
  
      Stream #0:2[0x80]: Audio: ac3, 48000 Hz, stereo, fltp, 192 kb/s
  
  Unsupported codec with id 100357 for input stream 0

  Then I run this command to transcode the file :

  ffmpeg -analyzeduration 100M -probesize 100M \
  
    -i WMAV.VOB \
  
    -map 0:1 -map 0:2 \
  
    -c:v libx264 -preset slow -tune film -crf 21 \
  
    -c:a aac -b:a 192k \
  
    wmav.mkv

  However, when I include -c:a aac, I get thousands of errors like this :

  Error while decoding stream #0:2: Error number -16976906 occurred
  
  [ac3 @ 000002bd24d8eec0] expacc 127 is out-of-range
  
  [ac3 @ 000002bd24d8eec0] error decoding the audio block

  There doesn’t seem to be any issue with the audio stream since it plays back fine in VLC. The transcode succeeds if I use -c:a copy.

  What is causing this error and how could I fix the problem ?