> Date: Tue, 27 Oct 2015 17:42:35 +0100 > From: barsn...@gmx.net > To: ffmpeg-user@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 > _______________________________________________ > ffmpeg-user mailing list > ffmpeg-user@ffmpeg.org > http://ffmpeg.org/mailman/listinfo/ffmpeg-user
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. _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user