MP4 plays still image + audio track

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Solved Re: MP4 plays still image + audio track

Postby slowjeff » 2018-12-27 03:08

Thanks to all.

I installed HandBrake and it appears to be going to convert these files to a usable format.

It didn't occur to me in advance that what GoPro called an MP4 file wasn't what the rest of the world called an MP4 file, but I learned a few valuable things from y'all in the process.

Thanks again
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Re: MP4 plays still image + audio track

Postby Segfault » 2018-12-27 13:31

This is workaround, not solution. And since all re-codings with lossy codecs also contribute to quality loss I'd say this is not a good workaround.
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Re: Solved Re: MP4 plays still image + audio track

Postby stevepusser » 2018-12-27 20:27

slowjeff wrote:Thanks to all.

I installed HandBrake and it appears to be going to convert these files to a usable format.

It didn't occur to me in advance that what GoPro called an MP4 file wasn't what the rest of the world called an MP4 file, but I learned a few valuable things from y'all in the process.

Thanks again


The mp4 format is just a container, so it can hold all kinds of different codecs. I still suspect that GoPro has their own custom one. Just type

Code: Select all
ffmpeg -codecs
to see all the ones they've reverse-engineered for support there.
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Re: MP4 plays still image + audio track

Postby Segfault » 2018-12-27 20:48

Handbrake opened it, in its Activity log is description of source, including codecs.

Edit: GoPro website tells it is H.264 and may be H.265 for some newer cameras, depending on recording mode. Although they do not mention if it is 8 bit, 10 bit or 12 bit. I'm assuming 8 bit.

We still do not know what video hardware is used. It may be H.264 is decoded in hardware and H.265 falls back to software decoding. Again, playing with VLC video output options may help. It defaults to Auto, but it may not be the best solution.

More edit: Being old is not an excuse to solicit spoonfeeding. I'm old myself.
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Re: MP4 plays still image + audio track

Postby stevepusser » 2018-12-29 00:02

For what it's worth, I just backported Sid's VLC 3.0.5 for MX Linux, and it adds a 10-bit h.264 playback plugin, though that also needed a backport of libx264-155 from Buster. I can also play the latest new AV1 video codec in it, though that is probably due more to the backported ffmpeg 4.0.3 with libaom I've also got.

I'll see about adding those to my backports multimedia repo tomorrow when I have time.
The MX Linux repositories: Backports galore! If we don't have something, just ask and we'll try--we like challenges. New packages: Flightgear 2018.2.2, 4.19.13 kernel, wine-staging 4.0~rc4, Stellarium 0.18.3, VLC 3.0.5, Midori 7.0
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