Bigger MOOV headers regression

[zimbatm]

Summary of the bug:

FFmpeg's mp4 moov header is almost twice as big as when produced with MP4Box in some cases. I'm trying to hunt down why it's the case, esp. because it hasn't always been the case.

How to reproduce:

# NOTE: big-header-video.mp4 got cut from a larger 2h file
% wget http://ffmpeg-debug.s3.amazonaws.com/big-header-video.mp4
% ffmpeg -i big-header-video.mp4 -acodec copy -vcodec copy ffmpeg.mp4

See ​https://gist.github.com/zimbatm/5473549 for the details on the investigation. It's a little bit mixed up because I didn't really know what I was looking for.

I am still investigating the issue, please bear with me.

[Carl Eugen Hoyos]

To make this a valid ticket, please provide the failing command line together with the complete, uncut console output.

[zimbatm]

Here is how to reproduce the problem:

wget http://ffmpeg-debug.s3.amazonaws.com/1050-moov-header-size/moov-header-sample.mp4
ffmpeg -i moov-header-sample.mp4 -acodec copy -vcodec copy -y ffmpeg.mp4

I don't think that any compilation options make a difference and I can reproduce it on Linux and OSX.

After fc09bf57a60d4c4a6d339b204b3282337067c06d the moov header size is 1.5x bigger than before.

[Carl Eugen Hoyos]

Please post the failing command line together with the complete, uncut console output to make this a valid ticket.

[Michael Niedermayer]

Please see -chunk_duration and -chunk_size. For example -chunk_duration 500k will decrease the moov size from 7808 to 4800