Converting to AVI - 2 pass encoding

[fishy6969]

I'm using the post-processing to XVID built into the latest version of GBPVR - it works well IMHO. My question - does anyone know how to change the encoding into two passes? I found a line alluding to xvid encoding in the config.xml file but wasn't sure how to change it and not screw things up.

Many Thanks

[djtaylor]

From the documenation at http://ffmpeg.sourceforge.net/ffmpeg-doc.html

Try using these

`-pass n'
Select the pass number (1 or 2). It is useful to do two pass encoding. The statistics of the video are recorded in the first pass and the video is generated at the exact requested bitrate in the second pass.
`-passlogfile file'
Set two pass logfile name to file.

David.

[fishy6969]

Thanks for that info - I've checked the FFMpeg website and have the settings I want. My only problem is how to integrate that into the config.xml file:-

Code:

<CustomFFmpegConversions>
    <Conversion name="XviD" cmd="-i {SOURCE_FILE} -f avi -vcodec xvid -b 1250 {DEST_FILE}" targetExtension=".avi" />
    <Conversion name="Video Ipod" cmd="-i {SOURCE_FILE} -f mp4 -vcodec mpeg4 -s 320x240 -r 15 {DEST_FILE}" targetExtension=".mp4" />
    <Conversion name="Sony PSP" cmd="-i {SOURCE_FILE} -f mp4 -vcodec mpeg4 -s 320x240 -r 15 {DEST_FILE}" targetExtension=".mp4" />
    <Conversion name="Mobile .3GP" cmd="-i {SOURCE_FILE} -acodec aac -vcodec mpeg4 -s qcif -aspect 4:3 -hq {DEST_FILE}" targetExtension=".3gp" />
  </CustomFFmpegConversions>

This seems to specify a single sets of commands per profile to send to FFMpeg - to do 2-pass encoding I think I'm right in saying that you would need 2 sequential commands ie

ffmpeg.exe -pass1 etc...
ffmpeg.exe -pass2 etc..

Any ideas gratefully received!

[djtaylor]

Hmm, don't know haven't tried it with ffmpeg.

What you could do is abandon that feature in gbpvr and instead use dirmon http://www.dragonglobal.org and run a batchfile instead.

Alternatively, schedule the conversion after the end of the recording in postprocessing.bat. If you launch ffmpeg with a start /low prefix then it won't slug the machine if there are other processes happening at the same time.

David.

[fishy6969]

Ah!! I hadn't come accross DirMon. I'll give that a go.
Thanks

[Emil]

So, what's the final solution to encode to xvid 2-pass? The built-in solution only allows 1-pass encoding.

[fishy6969]

The setting for the built-in solution looks to be in config.xml but I'm not confident changing these as I'm not sure of the structure. Instead I've started using the process outlined at

http://forums.nextpvr.com/showthread.php...processing

as this lets you have different profiles depending on program name etc. I'm getting good results so far. There's no user interface as such but editing the batch file is easy enough.