[FFmpeg-user] Specify FC instead of mono
Kevin Wells
kevwells at hotmail.co.uk
Wed Oct 28 08:16:11 CET 2015
> Date: Tue, 27 Oct 2015 17:42:35 +0100
> From: barsnick at gmx.net
> To: ffmpeg-user at ffmpeg.org
> Subject: Re: [FFmpeg-user] Specify FC instead of mono
>
> On Tue, Oct 27, 2015 at 14:17:45 +0000, Kieran O Leary wrote:
> > Perhaps mediatrace would be worth a shot? https://mediaarea.net/mediatrace/
>
> Ah, I didn't realize mediainfo could spit out details about the atoms.
> It can indeed...
>
> If the samples in the mentioned ticket
> https://trac.ffmpeg.org/ticket/2865
>
> notably SD_IVTC_8channel_ProResHQ_test.mov (from ffmpeg, incorrect)
> and SD_IVTC_8channel_ProResHQ_test_withT3.7.8_labels.mov (from QT Player, correct)
>
> expose exactly the same behavior, I can only say this with regards to
> the difference of the files (ignoring the developers' analysis of
> whether this can be fixed):
>
> I believe the audio channels in question differ as such:
> The "C" center channel:
>
> 00000D38 Channels (24 bytes)
> 00000D38 Header (8 bytes)
> 00000D38 Size: 24 (0x00000018)
> 00000D3C Name: chan
> 00000D40 Version: 0 (0x00)
> 00000D41 Flags: 0 (0x000000)
> 00000D44 ChannelLayoutTag: 6553601 (0x00640001)
> 00000D48 ChannelBitmap: 0 (0x00000000)
> 00000D4C NumberChannelDescriptions: 0 (0x00000000)
>
> vs.
>
> 00000D8C Channels (44 bytes)
> 00000D8C Header (8 bytes)
> 00000D8C Size: 44 (0x0000002C)
> 00000D90 Name: chan
> 00000D94 Version: 0 (0x00)
> 00000D95 Flags: 0 (0x000000)
> 00000D98 ChannelLayoutTag: 0 (0x00000000)
> 00000D9C ChannelBitmap: 0 (0x00000000)
> 00000DA0 NumberChannelDescriptions: 1 (0x00000001)
> 00000DA4 ChannelLabel: 3 (0x00000003)
> 00000DA8 ChannelFlags: 0 (0x00000000)
> 00000DAC Coordinates (0): 0.000
> 00000DB0 Coordinates (1): 0.000
> 00000DB4 Coordinates (2): 0.000
>
> Similar for the two other channels: QT seems to use "ChannelLabel" (3
> here, 38 and 39 for the two others channels in the sample), which
> ffmpeg does not. (Those two are different from your samples anyway,
> ffmpeg detects them as DL and DR instead of "downmix".)
>
> I have no idea how to fix this and won't dive into it either. ;-)
>
> Moritz
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Thats good work finding the differences, now we just need someone kind enough who knows how to change and action this.
I can only offer testing, examples, etc..
Kind regards.
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