[vlc-devel] mpeg2 video encoding

[Kaarlo Räihä]

Anton Kapela kirjoitti 11.11.2008 kello 18:41:
> Team,
> 
> I've recently switched several OSX and winXP systems to version 0.9.6
> of the vlc package. I've noticed that since moving to this version,
> mpeg2 video encoding seems to not work. Interestingly, mpeg2 audio
> encoding does work (though it's unclear to me where support this
> compressor comes from or what module it's packaged within).
> 
> I tested a previous version of VLC (0.8.6i, in my test case) and
> observed mpeg2 video encoding does indeed work.
> 
> I've placed -vvv output from two invocations (one using xvid .avi
> source file on disk, the other receiving a udp multicast stream via
> the network) of vlc command lines in the following pastebin url:
> 
> http://pastebin.com/m2ab7db36
> 
> In short, when I do "vcodec=mp2v" I get "cannot find video encoder"
> ..but only while using 0.9.6 (didn't test previous versions of
> 0.9...). The interesting part: I don't get this error when using
> 0.8.6i.
> 

I tested 0.9.6 under Win32 and I can encode MPEG-2 video and audio without any issues.
:sout=#transcode{vcodec=mp2v,vb=800,scale=1,acodec=mpga,ab=128,channels=2}:duplicate{dst=std{access=file,mux=ts,dst=C:\testi.mpg}}

So I don't think MPEG-2 encoder is broken.

> I did notice that (in the win32 version) 0.9.6i doesn't include
> libffmpeg_plugin.dll, persuant the 0.9-series release notes (in
> NEWS.txt - "The ffmpeg module has been removed and replaced by the new
> avcodec, avformat, swscale (or imgresample if you use a swscale-less
> ffmpeg build) and postproc modules.").
> 
> What has me stumped is trying to determine where mpeg2 video encoding
> support is supposed to come from, if not libavcodec. However, when I
> use a right 'out of the box' copy of 0.9.6, which definitely is
> packaged with libavcodec (as h264, mp4v, and mp2a all seem to work
> fine), somehow I'm missing mpeg2 video encoding. Of course, mpeg2
> video decoding works.
> 
> I've searched the vlc user list archive and the vlc forum to no avail.
> If, in fact, mpeg2 video encoding should work, I'd appreciate any
> pointers or advice in the correct use or invocation of said codec. I'm
> hopeful the only issue is my sheer ignorance of vlc.
> 
> Best,
> 
> -Tk
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