avi -> svcd ... no sound...

[Macker]

Hi.
I just tried to make my first SVCD from a 690 MB .avi (divx with AC3 sound). The movie does play with sound in quicktime (I have all codecs installed). I used the presets SVCD and only changed "no altivec" (still running on G3 )

So now I've got a m2v movie file - but no sound! I read somewhere else that the sound is encoded after the video - but nothing happened... there is only this mpeg-2 file, no .mpg or .bin for a svcd...

what could be the problem?

Thank you for any suggestions
Beginner

[Macker]

by the way: in the audio tab under "audio track", "0" is selected - I did not change this as there is nothing mentioned in the tutorial on the ffmpegx page...

by the way: in the audio tab under "audio track", "0" is selected - I did not change this as there is nothing mentioned in the tutorial on the ffmpegx page...

well, try to click the "Play" button right beside the "Info" button. if you hear no sound try another number until you hear sound...

[wibbler]

I noticed that the audio tab in its default position (0) works fine if ffmpeg is used to produce an MPEG-2, but need to be set to (1) if you use mpeg2enc, as mpeg2enc only produces an MPEG-2 video stream. The MPEG-2 audio is produced using mp2enc separately, the two are merged/multiplexed together at a later stage by mplex to produce a combined MPEG-2 audio/video file.

Hidden from the ffmpegX user, Mplayer is used to play the DIVX/OGM/AVI file and save out the audio as audiodump.wav, and a the same time stream the video through yuvscaler and into mpeg2enc to get the .MPV file. When yuvscaler/mpeg2enc has done its bit, mp2enc is started to encode the .WAV as a .MPA file. the .MPV and .MPA files are then merged with mplex to produce a combined .MPG

On my 867MHz G4 powerbook, a 90 minute film took around 12 hours to produce a .MPV file, and then another 30mins or so to produce a .MPA file, and then another 30 mins or so to merge them together to produce a .MPG file.

Using ffmpeg to produce the MPG is acomplished in one stage and does run quite a bit faster, but the MPEG-2 file produced gives problems with the dvdauthor program.

[major]

You should wait for the end of the process. The end of the process is reached when either a message "Finished" or "Failed" is displayed in the progress window. A success/failure sound will also ring. If the process was successful, you will obtain all the files. If the process failed, the process output (blue "i" icon) can be used to explain why it failed.

I like to see what's happening, so selected the 'show in terminal' option which disables the progress dialog. There are masses of status messages coming from the video chain (mplayer/yuvscaler/mpeg2enc) but next to nowt form the audio encoder (mp2enc) which may give the impression that all has finished, which it hasn't as mplex is called after the two streams are generated to merge them together.

I edited

/Applications/ffmpegX.app/Contents/Resources/mencvcdX

to replace the -v 1 by -v 0 on the yuvscaler and mpeg2enc commands which just leaves mplayer giving its status messages. The ecoding process runs a bit faster with those small changes. - perhaps the indiviual process verbosity could be controlled from the ffmpegX gui in a future version.

adding -quiet to the mplayer commandline cuts out its status messages as well if you want, then just the initial program messages are displayed along with any fail mesages..

W.I.Bler

[major]

If you want a quiet output, don't enable terminal and use the progress window instead. The process output is available through the blue "i" info window if you want to see it. You should not edit the script as you would break the normal progress window mode. I'll add more status messages in the progress window in future versions.