Recherche avancée

Sur d’autres sites (12984)

• Get mime type for MediaSource.isTypeSupported

  6 mars 2016, par Guig

  How do I get the Mime type I need to pass to MediaSource.isTypeSupported with ffprobe/ffmpeg ?

  For instance, on my computer, that returns true :

  MediaSource.isTypeSupported('video/mp4; codecs="avc1.64000d,mp4a.40.2"')

  while that doesn’t

  MediaSource.isTypeSupported('video/mp4')

  I’m not sure how to get what would correspond to the avc1.64000d,mp4a.40.2 part for a given video. Here is a larger list of what this part may look like.

  ffprobe -show_streams -i video.mp4 returns a number of interesting informations, including

  codec_type=video
  
  codec_time_base=1/40
  
  codec_tag_string=avc1
  
  codec_tag=0x31637661 

  and

  codec_type=audio
  
  codec_time_base=1/48000
  
  codec_tag_string=mp4a
  
  codec_tag=0x6134706d

  I’m not sure I should go with 'video/mp4; codecs="avc1.0x31637661,mp4a.0x6134706d"' since this returns false and I don’t know if it’s because it’s not the excepted argument or because the video is indeed not supported.

• fftools/ffmpeg_filter : do not assume av_buffersrc_get_nb_failed_requests()>0

  7 mars 2024, par Anton Khirnov

  fftools/ffmpeg_filter : do not assume av_buffersrc_get_nb_failed_requests()>0
  Apparently it can happen that avfilter_graph_request_oldest() returns
  
  EAGAIN, yet av_buffersrc_get_nb_failed_requests() returns 0 for every
  
  input.
  Works around #10795, though the root issue is most likely in the
  
  scale2ref filter.
  

  • [DH] fftools/ffmpeg_filter.c

• FFmpeg -filter_complex_script crop & blurbox with time based values

  6 juin 2021, par user1503606

  I am trying to create a script that will move a blur boxed across a video based on x and y cords in a text script.

  


  I can easily create a blur box with the following ffmpeg command.

  


  ffmpeg -y -i pex.mp4 -filter_complex_script cropblur.txt -map "[v]" out_crop.mp4


  


  The cropblur.txt has the following.

  


  [0:v]crop=400:400:300:350,boxblur=10[fg]; [0:v][fg]overlay=300:350:enable='between(t\,0\,5)'[v]


  


  This creates this.

  


  

  


  What I want is the blur box to move across where the lady is running.

  


  

  


  She obviously runs out from where the box is positioned.

  


  I can create a script where I can track the correct x and y positions for the blox using jquery ui or something I just dont understand how to implement this in a filter_complex_script.

  


  I thought it would be a simple as just appending to the script something like this.

  


  [0:v]crop=400:400:300:350,boxblur=10[fg]; [0:v][fg]overlay=300:350:enable='between(t\,0\,2)'[v]
[0:v]crop=200:200:200:360,boxblur=10[fg]; [0:v][fg]overlay=300:350:enable='between(t\,2\,3)'[v]
[0:v]crop=200:200:200:370,boxblur=10[fg]; [0:v][fg]overlay=300:350:enable='between(t\,3\,4)'[v]
[0:v]crop=200:200:200:380,boxblur=10[fg]; [0:v][fg]overlay=300:350:enable='between(t\,4\,5)'[v]


  


  Changing the time and the x position based on the incremented time.

  


  If I run this script I get this error.

  


  No output pad can be associated to link label '0:v'


  


  Obviously I am doing something wrong but I cannot find any documentation that really helps me understand how to do this https://ffmpeg.org/ffmpeg.html the official docs dont really help.

  


  I could do it by running multiple passes like this.

  


  ffmpeg -y -i pex.mp4 -filter_complex "[0:v]crop=400:400:300:350,boxblur=10[fg]; [0:v][fg]overlay=300:350:enable='between(t\,0\,2)'[v]" -map "[v]" out_crop.mp4 && ffmpeg -y -i out_crop.mp4 -filter_complex "[0:v]crop=200:200:200:360,boxblur=10[fg]; [0:v][fg]overlay=300:350:enable='between(t\,2\,3)'[v]" -map "[v]" out_crop2.mp4


  


  I Would just really like to understand how to use the filter complex scripts in this way ?

  


  Any help would be great.

  


  Thanks