Hi Tobias, On Mon, Sep 26, 2016 at 3:58 PM, Tobias Rapp <[email protected]> wrote:
> On 26.09.2016 13:10, Robert Krüger wrote: > >> Hi, >> >> On Mon, Sep 26, 2016 at 12:42 PM, Carl Eugen Hoyos <[email protected]> >> wrote: >> >> 2016-09-26 12:17 GMT+02:00 Robert Krüger <[email protected]>: >>> >>> I would like to know if it is possible to create a wave file that >>>> >>> contains >>> >>>> n channels of audio which do not have a channel layout like 5.1 or >>>> >>> stereo, >>> >>> (I assumed n==1 here because it should work fine for n>2) >>> >>> much like a file used in broadcast for just storing n signals in one wav >>>> file. >>>> >>> >>> It works fine for >16bit or >48kHz. >>> I just sent a patch that fixes it for all (pcm) audio, that will not fix >>> the >>> front center (mono) case though: If this is an issue (if your software >>> does not default to front center for 1-channel pcm wav), please >>> tell me;-) >>> >>> >>> >>> Thanks for the quick reply! I meant something like writing a 4,6 or >> 8-channel wav that just really contains 4,6,8 mono channels. E.g. some >> cameras or other multi-track recording devices generate signals like these >> and I would like to be able to put them in one wav file for archiving or >> later processing. >> > > If the input file doesn't have a channel mask you should be able to use > the "-guess_layout_max 0" input option. > > Reading a bit through a few specs I am not sure whether >> this requires using RF64 features (specifically the new constant >> SPEAKER_ALL 0x80000000 for the channel assignment) and, to be honest, if >> that makes sense at all. >> > > In my opinion an undefined channel mask makes sense in your case. I'm in a > very similar situation when recording AVI files with PCM audio and there I > use the "-write_channel_mask off" output option. > > You don't need RF64 features, see section "Details about dwChannelMask" in > https://msdn.microsoft.com/en-us/library/windows/hardware/dn653308.aspx : > > "If, for example in a multi-channel audio authoring application, no > speaker location is desired on any of the mono streams, the > dwChannelMask should explicitly be set to 0." > > Best regards, > Tobias > Thanks a lot! That was exactly the information I was looking for. Best regards, Robert _______________________________________________ ffmpeg-user mailing list [email protected] http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email [email protected] with subject "unsubscribe".
