Avisynth and ffdshow audio problem

[cyclopathic]

audio disappears in AviSynth when opened as

DirectShowSource("xyz.avi", audio=true)

and ffdshow AC3 codec set up to S/PDIF

file has .ac3 audio

[clsid]

Set it to liba52.

[cyclopathic]

Set it to liba52.
then there are problems:

- I have to have 2 different settings: one to play and another to encode
- this setting is not saved with profile when I switch btw encoding and play profiles
- I get PCM 2-channel stream (and I'd like to have AC3 pass through)

[tebasuna51]

then there are problems:

- I have to have 2 different settings: one to play and another to encode
- this setting is not saved with profile when I switch btw encoding and play profiles
I agree with these problems and also:
- How can guarantee the audio is decoded by ffdshow and not with others ac3 DS filters installed?

- I get PCM 2-channel stream (and I'd like to have AC3 pass through)

I think this is a AviSynth limitation because inside AviSynth the audio can't be compressed. All the audio functions only work with uncompressed audio samples.

If you want preserve the ac3 audio I think you need extract the ac3 before the AviSynth video transformation, and remux with the resultant video.

[cyclopathic]

I think this is a AviSynth limitation because inside AviSynth the audio can't be compressed. All the audio functions only work with uncompressed audio samples.

If you want preserve the ac3 audio I think you need extract the ac3 before the AviSynth video transformation, and remux with the resultant video.

Problem is I need to re-encode 195 episodes series, can you imagine re-muxing it manually? I'd rather see pass-through..

[clsid]

You could write a batch file to remux with some command line app like ffmpeg.

S/PDIF sends the compressed audio directly to your audio hardware. It is not a method to "do nothing" and leave the audio stream untouched for the next item in the software chain.