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• ffmpeg_opt : Set the video VBV parameters only for the video stream from -target

  25 mai 2015, par Michael Niedermayer

  ffmpeg_opt : Set the video VBV parameters only for the video stream from -target
  Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] ffmpeg_opt.c

• ffmpeg converted mp4 video format is not playing on html5 video player

  15 août 2017, par alina

  i have converted a video via ffmpeg to mp4 but its playing on desktop pc player like Vlc but not on html5 player or wordpress player.

  Iam using this command while conversion :

  ffmpeg." -i ".$video_to_convert." -i watermark.png -filter_complex 'overlay=10:main_h-overlay_h-10' -c:v libx264 -crf 17 -preset slow -c:a libfaac -b:a 192k -ac 2 -b:a ".$quality." -acodec libmp3lame -ab 126000 -ar ".$audio." -ac 2 -s ".$size." ".$converted_vids.$name.".".$new_format."

  where :

  .$video_to_convert. = input.mp4

  .$converted_vids.$name. = output.mp4

  is there any syntax problem ??????????????????

• Creating an MP4 video with ffmpeg from timestamped JPEG frames received by pipe

  16 août 2024, par Denis Fevralev

  I need to create a video with following conditions :

  


  

  1. It can only be made from a sequence of JPEG files, each having its timestamp (milliseconds) in the name. The images' durations are not the same, they differ, so i cannot just concat them all and use particular fps

  


  2. There are several tar archives with the images sequences, the archives are kind of huge so I read them from a file storage as an async steam of data and cannot save them on the disk as files. The frames are read and right away put to ffmpeg running process stdin.

  


  3. The images may have different aspect ratios so it's required to make a NxN square and scale the images to fit in with filling the empty space with pads

  


  


  My current solution :

  


  ffmpeg -r $someFpsValue -i - -vf scale=w=$w:h=$h:force_original_aspect_ratio=1,pad=$w:$h:(((ow-iw)/2)):(((oh-ih)/2)) result.mp4


  


  As you can see, it doesn't let me concat the images with correct durations. I know that the concat demuxer can solve the problem of merging images with different durations but seemingly it doesn't work with pipe protocol. I have an idea of evaluating an average fps as (videoFramesCount) / (videoDurationInSeconds) for -r argument, or maybe even counting the fps for each video's second and then getting the avg, but maybe there is a more reliable solution (like some concat demuxer analogue) ?

  


  Thanks in advance :)