2
votes
0answers
76 views

How to merge MP4 files with different bitrates?

I want to merge two or three MP4 videos with MPEG-4 AVC video codec and MP3 (sometimes MP3 Surround) audio codecs. Both audio and video can have different bitrate. If it will be possible, without ...
1
vote
1answer
1k views

ffmpeg - concatenating two MP4 files results in bad output file

I generated two MP4 files - a five-second intro file, which is created by the script below, and the main video (about one minute long) is created by screen-cast-omatic, both in MP4 format. When I ...
0
votes
1answer
352 views

MP4Box and concatenating files with different aspect ratio

I have a large directory of small video clips taken with a cell phone. I've been able to use mp4box to concatenate them into a single file nicely EXCEPT if they are different aspect ratio. In this ...
1
vote
1answer
559 views

How can I extract tags from a MP4 file with MP4Box or mediainfo on the command line

I want to extract tag information like title, author, encoded date, tagged date and so on from several video, audio and subtitle tracks in .mp4 files (for later use in mkvmerge). I need the extracted ...
0
votes
1answer
605 views

Windows Explorer not showing film frame for .mp4

Anyone knows what part of registry is related to this film frame? I installed and uninstalled mp4box, avidemux, YAMB try to set default aspect ratios but failed, and now I have a new problem.
1
vote
1answer
711 views

Merging h264/MP4 files with mp4box results in seeking and sync issues

I've a problem while merging two h.264/MP4 files with the same parameters except length. I'm merging by mp4box -cat .... After that, video players behave strangely: If I drag time slider closer to ...
0
votes
1answer
705 views

MP4 re-ecoding to guarantee concatenation without re-encoding

I have 2 mp4 videos that fail to concatenate when using: MP4Box -add 1.mp4 -cat 2.mp4 out.mp4 Is there a way to re-encode 2.mp4 so that the concat call will create a valid output? Possibly with ...
0
votes
2answers
3k views

Why does my mp4 (h.264) need mp4box all the time?

Whenever I convert a video into mp4 with h.264 codec, it doesn't play immediately on Windows or iPad. It plays fine when I convert the video with mp4box. I use the following command to convert. ...
4
votes
5answers
2k views

Extract audio aac from mp4

Is there a command line tool for Windows to extract audio aac from mp4 ?