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• avformat/dv : fix timestamps of audio packets in case of dropped corrupt audio frames

  31 octobre 2020, par Marton Balint

  avformat/dv : fix timestamps of audio packets in case of dropped corrupt audio frames
  By using the frame counter (and the video time base) for audio pts we lose some
  
  timestamp precision but we ensure that video and audio coming from the same DV
  
  frame are always in sync.
  This patch also makes timestamps after seek consistent and it should also fix
  
  the timestamps when the audio clock is unlocked and have a completely
  
  indpendent clock source. (E.g. runs on fixed 48009 Hz which should have been
  
  exact 48000 Hz)
  Fixes out of sync timestamps in ticket #8762.
  Signed-off-by : Marton Balint <cus@passwd.hu>
  

  • [DH] libavformat/dv.c
  • [DH] tests/ref/seek/lavf-dv

• ffmpeg : error messages when creating prores

  10 septembre 2020, par user14245857

  I'm trying to convert from TIFF, 16-Bit, Raw, little endian to ProRes 4444 with ffmpeg

  


  command line is :

  


  ffmpeg -f image 2 -i 0%05d.tiff -c:v prores_ks –profile:v 4444 –v:f scale=2048x1550 –pix_fmt yuv444p10le out.mov


  


  Error messages are :

  


  „Unknown dref type 0x206c7275 size 12 “

„cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0]"


  


  My suspicion is, that ffmpeg is only supporting 10-bit for ProRes codecs ("ffmpeg –h encoder=prores_ks"). But that is why i specifically put "–pix_fmt yuv444p10le" in the command line.

  


  But ffprobe -i out.mov tells me that ffmpeg used "yuv444p12le" as pix_fmt!

  


  Why does ffmpeg use a pix_fmt that it doesn't support although told differently in the command line ?
(Another output of the log : "[prores @ 0000025d28ece880] Auto bitdepth precision. Use 12b decoding based on codec tag")

  


  Are the error messages ("Unknown dref..." and "cur_dts...") resulting from unsupported 12-Bit ?

  


  Thanks already for your helpful answers

  


• FFMPEG how to use https dynamic url as input for amovie filter

  2 juillet 2020, par Johny Sharma

  Basically what i am trying to do is to calling a dynamic php url which is generating a audio file for me and just want to use that file as an input for amovie filter.
I hope you have understand my question.

  


  What i have done so far ?

  


  I have a FFMPEG code which is :

  


  ffmpeg-y -i 'bg-file.mp3' -c copy -map 0:0 -map 1:0 -filter_complex "amovie='/auth.php?input=string&l=hi&f.mp3':loop=999[sc][mix];[0:a][sc]sidechaincompress=threshold=0.100:ratio=20,volume=10dB:precision=fixed[bg], [bg][mix]amix=duration=first"  -c:a libmp3lame -ac 2  "save.mp3"


  


  This line is calling my dynamic url for generating the required song.

  


  "amovie='/auth.php?input=string&l=hi&f.mp3'


  


  Everything is working if i check them apart. but when i use them together the ffmpeg is giving the following error.

  


  [22] => [Parsed_amovie_0 @ 0x1378140] Failed to avformat_open_input '/auth.php?input=string&l=hi&f.mp3':loop=999'
[23] => [AVFilterGraph @ 0x1368ca0] Error initializing filter 'amovie' with args '/auth.php?input=string&l=hi&f.mp3':loop=999'
[24] => Error initializing complex filters.
[25] => No such file or directory


  


  I dont know is it possible to put a dynamically generated url as an input for amovie filter or not ?
if i open my dynamic url in browser its works like a mp3 file and play similar to any mp3 file.

  


  using this code to play that mp3 :

  


  header('Content-Description: File Transfer');
header('Content-Type: application/octet-stream');
header('Content-Disposition: attachment; filename='.basename($path));
header('Content-Transfer-Encoding: binary');
header('Expires: 0');
header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
header('Pragma: public');
ob_clean();
flush();
readfile($path);
exit;


  


  This one looks similar to my query but slightly different and that's why i am still looking for a solution

  


  How to use https input with ffmpeg "amovie" filter ?