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• Moviepy write_videofile changes number of video and audio frames even after using 'rawvideo' as the codec parameter

  14 mars 2019, par Jaideep Sagar

  I am using moviepy (Python) to read video and audio frames of a video and after making some changes I am writing them back to a videofile, say new.avi, to preserve the changes, or to avoid compression, I am using codec= ’rawvideo’ in write_videofile function. But when I read the video and audio frames back, the number of video and audio frames are different than when they were when written, they are usually increased.
  Can anybody tell me the reason, ? is it because of the ffmpeg used or some other reason ? Does it happen always or there is some problem in my machine ? Thank you :-)

• How to discard context reinits during H264 video decoding from GStreamer webrtcbin

  20 mars 2019, par Szymon Piechaczek

  Gstreamer pipeline is receiving video this way :

  webrtcbin -> rtph264depay -> avdec_h264 -> ...

  I’ve enabled do_nack on rtpbin inside webrtcbin to make video quality better but the problem is that lost buffers from RTP cause ’sometimes’ h264 decoder to Reinit context to ... which makes the whole output video grey (with only movement visible) until the next keyframe is received (but this can happen many seconds later).

  I’ve noticed that EVENT_GAP is emitted right before context reinit but dropping them doesn’t help.

  How to make decoding artifacts acting ’as always’ on the corrupted video, not to fill the whole video with grey ?

• How to split multiple videos 2.24 seconds before the end

  15 décembre 2019, par Leendert

  I have a folder with 100 videos, I need to split all videos into 2, the split needs to happen 2 seconds before the end of every video.

  I want to keep both parts of the video after the split.

  So far I have the code below, this will trim 2 seconds from the end of every video that is in de same folder as the .bat file.
  It will put the new videos inside of a folder called ’new files’.
  The problem is that the length of the video is not trimmed. Only audio and video. So the last 2 seconds will just be the last frame and no audio.

  for %%a in ("*.mp4") do ffmpeg -i "%%a" -filter_complex "[0]trim=2,setpts=PTS-STARTPTS[b];[b][0]overlay=shortest=1" -shortest -c:a copy "newfiles\%%~na.mp4" pause