Merge videos of different bitrate and resolution

Questions involving a Windows version of FFmpeg.
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Priyal
Posts: 1
Joined: Wed Sep 18, 2013 12:21 pm

Merge videos of different bitrate and resolution

Post by Priyal » Wed Sep 18, 2013 12:33 pm

Hello

I want to merge many video clips that has audio in them and are of different bitrates as well as use different codecs.

I tried the following command:

ffmpeg -i 1.mp4 -sameq 1.mpg
ffmpeg -i 2.mp4 -sameq 2.mpg
cat 1.mpg 2.mpg | ffmpeg -f mpeg -i - -sameq -vcodec mpeg4 output.mp4

But output.mp4 does not have synchronized audio or sometimes has no audio.

I also tried combination of mp4box but faced similar issue.

ffmpeg -i D:\n.mp4 -c:v libx264 -vf scale=426:238 -r 60 -c:a aac -ar 48000 -b:a 160k -strict experimental -f mpegts D:\1.ts

ffmpeg -i D:\new.mp4 -c:v libx264 -vf scale=426:238 -r 60 -c:a aac -ar 48000 -b:a 160k -strict experimental -f mpegts D:\2.ts

mp4box -cat D:\1.mp4 -cat D:\2.mp4 D:\13.mp4

I also tried mencoder:

mencoder -audio-preload 0.0 -oac copy -ovc copy -o D:\output1.mp4 D:\test.mp4 D:\n.mp4

But it gave poor distracted video.

Please suggest the solution for merging videos.

Thanks in advance

Harleycarr
Posts: 1
Joined: Fri May 03, 2019 7:49 am

Re: Merge videos of different bitrate and resolution

Post by Harleycarr » Fri May 03, 2019 7:59 am

I'm having a similar issue trying to concate 2 mp4 files and the second one has audio out of sync-progressively worse as it plays. I need to merge looslessly and without realizing-encoding. it seems that either the fps are different, or the timestamp do not align. I'm not sure how to solve the problem though. Have you had any luck with your own solution? I am limited to only Android software solutions.

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