11/10/2022 0 Comments Ffmpeg map all audio streams![]() ![]() With 2 mono audio streams into one single stereo channel audio stream For example, if you need to merge a media (here input.mkv) ![]() If you need this feature, a possible workaround is to use the amergeįilter. Splitting a stereo stream into two single channel mono streams is Two separate mono streams into a single stereo stream. ![]() It is therefore not currently possible, for example, to turn (from the same or different files) and merge them into a single output Pick multiple input audio channels contained in different streams Note that currently each output stream can only contain channels fromĪ single input stream you can't for example use "-map_channel" to OK, I read pretty deep into the ffmpeg man page and found this which should be useful: #FFMPEG MAP ALL AUDIO STREAMS FULL#In full line it might look like: ffmpeg -i in.mp4 -c copy -map 0 out.mp4įor more info see the documentation on stream selection and the -map option. The correct syntax is: ffmpeg -i in.mp4 -vcodec copy -c:a copy -map 0:0 -map 0:1 -map 0:2 out.mp4įFmpeg have option to map all streams to output, you have to use option -map 0 to map all streams from input to output. I managed to find the correct syntax from this ticket. To unsubscribe, visit link above, or emailįfmpeg-user-request at with subject "unsubscribe".Apparently this is a popular question, so I'm posting my solution as an answer (was previously a comment reply) so that others can see. BM devices will provide you with 2,8 orĬhannels depending on how you set it up. I?ve seen them used for everything from aĬlick track to a COM system relay. It supports 16 channels of audio, and people > Maybe I need to use something like "-map_channel" and then to define the On Wednesday, Novem6:47:32 PM CST Mustafa Al Ani wrote: Which streams you want to use and map those to the output streams youīetreff: Re: Audio channels mapping - Decklink SDI But basically you need to see in the CLI output, '-filter_complex' to do in depth mapping. Use the '-map' option to select the correct streams or even use If you want to specify which audio you'd like to pass thorugh you might I think by default ffmpeg will only put the first two audio channels into If I understand correctly, you'd like to pass through the audio layout > channels depending on how you set it up. > Can anyone help with the correct command to passthrough the audio > number of audio channels provided by the video source. > There is no format detection options for audio capture to determine > "channel_layout=unknown" which I think is a known issue with Decklink > "stream_specifier.channel_id" and when I ffprobe the SDI input I get > audio output layout BUT to do so I need to know > Maybe I need to use something like "-map_channel" and then to define > Tried "-ac 8 -acodec copy" but it doesn't seem to be working. > What I need to do is to passthrough all audio channels and to keep the > The SDI signal has 8 audio channels with the following layout: > I'm trying to encode Decklink SDI input and stream it to NDI and keep
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