bavc
align audio and video on the timeline according to frame:pkt_pts_time
I dropped an MP4 into 0.7.2 and parts of the video are abruptly dropped from analyzation. After transcoding to MOV via ffmpeg, the video dropped in fine. I attached both files in a zip.
This is because of the way it is edited, but yes it's not plotted quite right. The video contains a 0.6006 second presentation, but the video track includes -1.634968 seconds before the presentation starts. The first I-frame is at the -1.634968 second point on the timeline, so the first -1.634968 should play but needs to be present so that the B frame at the start of the presentation can present correctly. When you transcode to mov, the pre-0 part of the timeline is not used in the transcoding so it resolve the issue.
The file doesn't contain the before-0 audio, but only audio that aligns with 1.62406-2.22778 seconds of video, so the audio track is far shorter than the video.
IMO the timeline should look like: Video on a timeline of -1.634968-0.567234 seconds Audio on a timeline of -0.010917-0.589083 seconds
example of the ffprobe doc for the mp4 sample file https://gist.github.com/dericed/488594bbcff528d409b3
@ElderOrb, samples in https://github.com/bavc/qctools/files/141513/Archive.zip