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• How can I remove “original display aspect ratio 16:9” from a mp4 file using ffmpeg ?

  21 juin 2020, par Михаил Бурд

  I wish to remove the Original display aspect ratio entry from the video section.

  


  Video
ID                                       : 2
Format                                   : DV
Format settings, wrapping mode           : Frame
Codec ID                                 : 0D01030102020201-0401020202010200
Duration                                 : 1 h 34 min
Bit rate mode                            : Constant
Bit rate                                 : 24.4 Mb/s
Width                                    : 720 pixels
Height                                   : 576 pixels
Display aspect ratio                     : 4:3
Original display aspect ratio            : 16:9
Frame rate mode                          : Constant
Frame rate                               : 25.000 FPS
Standard                                 : PAL
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Scan type                                : Interlaced
Scan order                               : Bottom Field First
Compression mode                         : Lossy
Bits/(Pixel*Frame)                       : 2.357
Time code of first frame                 : 00:00:00:01
Time code source                         : Subcode time code
Stream size                              : 16.1 GiB (76%)
Title                                    : Picture
Color range                              : Limited
Transfer characteristics                 : BT.601


  


  If I want to remove the Original display aspect ratio entry completely, what ffmpeg command can I use to achieve that ?
Thank you.

  


• 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 ?

  


• avcodec/v4l2_m2m_dec : remove redundant packet and fix double free

  16 juillet 2020, par Andriy Gelman

  avcodec/v4l2_m2m_dec : remove redundant packet and fix double free
  v4l2_receive_frame() uses two packets s->buf_pkt and avpkt. If avpkt
  
  cannot be enqueued, the packet is buffered in s->buf_pkt and enqueued in
  
  the next call. Currently the ownership transfer between the two packets
  
  is not properly handled. A double free occurs if
  
  ff_v4l2_context_enqueue_packet() returns EAGAIN and v4l2_try_start
  
  returns EINVAL.
  In fact, having two AVPackets is not needed and everything can be
  
  handled by s->buf_pkt.
  This commit removes the local avpkt from v4l2_receive_frame(), meaning
  
  that the ownership transfer doesn't need to be handled and the double
  
  free is fixed.
  Signed-off-by : Andriy Gelman <andriy.gelman@gmail.com>
  

  • [DH] libavcodec/v4l2_m2m_dec.c