SageTVTranscoder and Convert: can I force "-acodec copy"?

[phelme]

Is there notation for transcoder/formats that can force "-acodec copy"?

if I leave off the [bf\=aud;] notation and try to use "-acodec copy" in MCompressionDetails, Sage throws in "-an" to disable audio decoding altogether.

Any ideas?

[JREkiwi]

I always thought just having [bf\=aud;] did a copy of the audio.

John

[phelme]

Originally Posted by JREkiwi

I always thought just having [bf\=aud;] did a copy of the audio.

John

yeah, that's what I hoped it would do, but it did an ac3, 2 channel encode instead of "-acodec copy" when I tried it. which I think forces a re-encode of the audio. maybe I did something else wrong. I'll keep fiddling; the drag is having to stop and restart the service each time for editing the properties file.

[nyplayer]

You could try this.

[bf\=aud;f\=copy;]

[phelme]

Originally Posted by nyplayer

You could try this.

[bf\=aud;f\=copy;]

well, maybe that use to work, but with 7.0b10 it gives me this:

"C:\Program Files\SageTV\SageTV\SageTVTranscoder.exe" ... -acodec ac3 -ac 2 -ar 48000 -ab 384000 ...

It always mixes down to 2 channels, even on 5.1 encoded content, which is not what we want. I saw in past messages in the forum that "f\=copy" use to be used throughout the transcoder formats in the prop file, but today they seem to have been all stripped out.

If I run the SageTVTranscoder directly substituting "-acodec copy" it works just fine. So we just need to get Sage to address this. I guess that means I should file a bug.

I went down this path because I've discovered that when down converting via SageTVTranscoder, audio is still sometimes out of sync on some HD-PVR encoded transport streams in 7.0. I was trying to see if any options would address this. After spending some time on the ffmpeg.org site, I've found that the "-dts_delta_threshold 0 " option can work and so far I haven't found any cases where it doesn't. Which is encouraging.

[phelme]

Just an update. Sage confirms that there is no (supported) AC3 audio copy method at this time for the SageTVTranscoder and don't recommend using "-dts_delta_threshold 0" either for audio sync. Both have issues in the ffmpeg core where 100% reliability of conversions is a problem.

I can confirm since my last post I've seen some craziness on at least one HD-PVR ts file converted with "-dts_delta_threshold 0." While using the Cyberlink H.264 decoder at least, the video was all screwy (but the audio was in sync!! ). The file played fine with ArcSoft and MPC-HC however.

Back to using mediashrink and Handbrake full-time I guess.