FFAStrans forum

Hi Guys,

Sorry if this is a bit of a noob question, I really love the software.

I have been using the software to create proxies of our High Res video for offline use before being reconnected to the full res after the edit has been completed.

We have a lot of files which have been shot with 8 individual audio streams (each mono). I need the output streams to match the source (i.e. 8 audio streams). I have been using the channel mapper filter to try and achieve this but it doesn't quite do what I need (e.g. outputting one audio stream with 8 channels inside). This is to allow for easier relinking within premiere. Is there a way to bypass the channel filter (and even the custom FFMPEG script) that I have been using and output with the proxy matching the source?

Here is what I have been doing so far incase it helps:

Watch Folder > AV Media (Use Both with Intelligent Decode) > Channel Mapper Filter > Custom FFMPEG Audio + Video Codec Checked (Audio I have just been copying the input codec into the custom ffmpeg at pcm_s24le ; Video Codec -vendor apl0 -quant_mat proxy -pix_fmt yuv422p10le -alpha_bits 16 -profile:v 0 ) and then output to watch folder.

and here is what I need to do:
High Resolution Video File from Camera (usually MPEG2 video in MXF wrapper) with 8 Audio Streams (each mono) > ProRes Proxy file with 8 Audio Streams (each mono) (preferably the same codec as the MXF).

Any ideas on how to do this?

Thanks for the help,
Shane

Hi Shane, thank you for using FFAStrans and welcome to the forum!

Try and add the following to you command line: "-map 0:a"
This will copy the all audio streams and corresponding channels from the original media and output using the audio codec specified. If you set audio codec to "copy" it should be a straight stream copy of all audio streams.
Also, drop the decoder and channel mapper steps. Go straight from the monitor to the encoder.

Hope this helps.

-steinar

Hi Steinar,

Thanks for the information being generally familiar with FFMPEG I feel silly forgetting I could use map. I was still not able to output 8 channels of audio initially after adding the map command HOWEVER after changing my codec to AAC the map feature worked as it should. So I can only assume the s24le codec that I was using was having some sort of funky compatibility issue.

AAC works fine for us though which is great!

Thanks,
Shane