May 12, 2021, 01:57:28 AM

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GH5 footage audio problem

Started by LifeOfBrian, May 04, 2021, 09:43:26 AM

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LifeOfBrian

Hi everyone and thank you to the developers of Avidemux for a VERY useful tool! Even for professionals.

I use Avidemux almost exclusively in copy mode as an on-the-fly cut tool in the field to cut away useless footage at the end of a shoot, before storing, uploading or sending off to a studio for post production. This way I keep the files "small" and in original quality.

This works well for my action cams, drone etc but... I can't seem to get the audio from the Panasonic GH5 to play OR copy correctly. The stream appears scrambled and inaudible. The footage from the GH5 is MPEG-4 AVC 10bit H264 High 4:2:2 All Intra 4096x2160 / 24fps at 400mbps with a 24bit audio stream at 96khz in an mov container.

I currently use VirtualDub2 successfully for this task, but since VD can't direct stream copy non-I frame footage, I'm forced to work with both tools. Needless to say I would really like to just use one. Preferably Avidemux.

According to the update history PCM audio with MPEG-4/mov footage should be completely compatible with Avidemux by now, no? I've tried many different settings and versions: nightly, VC, portable, 2.7.7, 2.7.8, 2.7.9... Same result. Am I doing something wrong??

Below is an audio example of the playback I get from the GH5 footage in Avidemux, along with a screenshot of the audio profile.

Really hope someone can resolve this issue!

Cheers :)

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eumagga0x2a

May 04, 2021, 09:59:59 AM #1 Last Edit: May 04, 2021, 10:01:39 AM by eumagga0x2a
Please provide an original sample video (short, 1 to ~2 minutes in duration, if possible), using WeTransfer (no email address required despite the interface trying to suggest otherwise!), Mega, Dropbox or Google Drive.

Could be a problem with sampling rate (I don't have any 96 kHz samples at the moment).

LifeOfBrian

Cheers mate, will have to wait a day for wifi. It's a 4.53gb file :)

eumagga0x2a

Please shoot a brief video, 1 minute long. It cannot be that big then.

eumagga0x2a

No sample needed anymore, I can reproduce the issue with Avidemux' own output, created by adding an external 24-bit PCM audio track to a video and saving to MOV in copy mode. The video plays fine in mpv. Looking into it.

LifeOfBrian

Cheers mate! I tried to reply here but for some reason it wouldn't let me. Said "CleanTalk: ***Forbidden. Please enable JavaScript***" So, I sent you my reply with link to original footage.

Much appreciate any help!

eumagga0x2a

Should be fixed by [demuxers/Mp4] Fix parsing of sound sample description version 2, verified with your sample video. Please try a future nightly build – native or cross-compiled.

Thank you very much for your report.

LifeOfBrian

No worries. Cheers mate! Looking forward to it. Any thoughts on when that build might be avail?

eumagga0x2a

I asked for nightly refresh yesterday. If nothing happens within a couple of days, I'll ask again, but I am not going to press the maintainer. You should be able to cross-build your own Avidemux on Linux for Windows anytime, it is well documented.

LifeOfBrian

Cheers mate! No worries, I'll brace myself with patience and keep an eye out for the next nightly update :)