[FFmpeg-user] Using video from an Android - concat with intro/outtro

[Jonathan Baecker]

Am 22.08.2016 um 22:02 schrieb Steven Burns:
> I have a project where I am receiving video uploaded from an Android phone, and processing the video with a scripted stock intro/outtro/overlays.
>
> The issue is during the concat process the android portion of the video is not playing correctly.  Choppy, jerky, skipping frames.  Audio is perfect though.
>
> The resolution is consistent from the android phone and stock videos (720X1280 - yes profile).
>
> The most notable warning I’m seeing is (which repeats many times while combining the files):
> [mp4 @ 0x7fe4ab814e00] Non-monotonous DTS in output stream 0:0; previous: 238517, current: 125112; changing to 238518. This may result in incorrect timestamps in the output file.
>
> Pretty sure “something” is not a match between the stock video and Android generated video - but not positive what to look for. Curious if there is anyone here who has worked on sanitizing video formats for concat to ensure all video sources match - or if there are other obvious things I’m missing.
>
> Digging around for possible answers, though I would post to the group though in case someone can help.
>
How is your concat commend? When you copy video/audio codecs then all 
files must have the exact same setting (resolution, video and audio 
codec, frame rate). When there is a different, then it will not work. Do 
you work with a concat list file?