I'm using 0.4.9-pre1 of ffmpeg and it appears to produce good AC3 output. Some versions before this gave similar problems to what you encountered - my amplifier didn't like it and 1 of the 2 DVD players didn't like it either.
-- Ray
Steven M. Schultz wrote:
On Thu, 30 Dec 2004, Steven Boswell II wrote:
value you see in the script. ffmpeg is the only open-source program I know of that can generate Dolby AC3 audio, so I use it.
Hmmm, what are the magic options to generate a valid AC3 file with
ffmpeg? I've created AC3 files with it that 1) are rejected as
invalid by DVD Studio Pro and 2) produce silence when the DVD is
played on a settop player. The channel rematrixing information seems
to be the problem.
It's not a big problem for me since I put the .wav files thru A.Pack (the Dolby certified encoder that came with the DVD authoring package) but it's fairly slow and isn't scriptable so it'd be nice to have an alternative method of creating AC3 files.
MPEG-1/Layer-2 works fine (I have yet to encounter a DVD player that refuses to play it even though it's not officially required by US DVD players).
The "yuvmedianfilter" command is there to lightly blur the video, to remove spatial noise that becomes really obvious once y4mdenoise has done its job.
I usually put in a '-t 0' to leave the luma alone and just blur the chroma. Doesn't affect the bitrate much but does help the colored areas, especially with animation.
Cheers,
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