[FFmpeg-user] Poor quality output when converting avi to mp4

Ute Willmore uwillmore at remotegeo.com
Fri Jul 28 01:26:38 EEST 2017

Unfortunately, I ran into a serious problem with the solution you provided,
I don't recall if I mentioned already that the 64 bit version of mp4box I
got from https://gpac.wp.imt.fr/downloads/gpac-nightly-builds/ doesn't work
at all for me. I always get a message from Windows saying the application
stopped working.

I was able to use the 32 bit version on the short 18 second video I was
using for testing (hd.avi). But when I tried a larger file yesterday to see
how long mp4box would take to extract the raw video, it also crashed with
that same message:

*mp4box has stopped working. A problem caused the program to stop working
correctly. Windows will close the program and notify you if a solution is

File I tried to process is just under 70 kb large but we need to process
much larger files than that. I have one sample file that is almost 1800000
kb in size and he files could be larger than that.

I first got the latest daily build of the  32 bit and 64 bit Windows
versions from GPAC. When I noticed the crash, I went to their official
download site and got both version there, but they both crash when I run a
larger file in mp4box. The 32 bit version can handle the short test file
but the 64 bit version will crash even with the small file.

I started the debugger and found out the problem is an unhandled exception.
There is also a Error message in the systems Application log, but it
doesn't tell me anything helpful either.

I will file a new issue in the GitHub but I don't expect an answer quick
enough to help.

Which version are you using Gyan? Maybe I can get the same version? I
really don't want to start all over trying to find a way to extract the raw
video with a different application.

Anyway help would be appreciated.

Thanks again

On Wed, Jul 26, 2017 at 11:15 PM, Gyan <gyandoshi at gmail.com> wrote:

> On Thu, Jul 27, 2017 at 12:29 AM, Ute Willmore <uwillmore at remotegeo.com>
> wrote:
> >
> > *Would you mind if I posted your solution on the super user group?* I
> just
> > want other users of ffmpeg to have this solution available to them. It
> > could save someone a lot of time and frustration.
> > I will also include the bug report Carl Eugen Hoyos filed.
> >
> You're welcome. Go ahead at SU.
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