[MPlayer-users] SVCD from TV card
Torsten Römer
troemer at swipnet.se
Wed Dec 24 06:49:44 CET 2003
rcooley wrote:
> MPlayer is very flexible, it will play practically anything...
Actually MPlayer had problems, it was hanging every few seconds for a
short moment. Only Xine was playing it fine.
> You wouldn't be if you read the docs... -of mpeg is for mpeg1, not
> mpeg2.
I read the docs. But the manpage and the HTML docs only mention MPEG,
never MPEG1 regarding the -of mpeg option.
> Yes, mplayer has no problem playing an MPEG2 video inside an MPEG1
> container... You won't be so lucky with other players.
[...]
> Yes, your DVD player doesn't like it because it isn't really an MPEG2
> stream.
OK, that's clear now. I didn't know the container has to be of the right
format as well. If the docs could explicitly state that -of mpeg is only
good for MPEG1 it would be helpful for non-experts like me :-)
I will try transcode with ffmpeg. And I will also try your suggestion
dumping into separate files and then multiplexing them.
Thanks for your reply, it is very helpful.
Torsten
> On Mon, 22 Dec 2003 15:40:50 +0100
> Torsten Römer <troemer at swipnet.se> wrote:
>
>
>>I am trying to encode to SVCD from the TV card. It "almost" seems to
>>work, MPlayer and Xine can play the resulting SVCD (while MPlayer
>>hangs a bit) but my DVD Player cannot play it at all (just hangs)
>
>
> MPlayer is very flexible, it will play practically anything... Hardware
> players are almost always the exact opposite, and will only play if it
> is exactly how it wants it.
>
>
>>I encode like this:
>>
>>mencoder -tv driver=v4l:width=480:height=576 tv://
>> -of mpeg
>> -ovc lavc
>> -oac lavc
>> -lavcopts
>>vcodec=mpeg2video:vbitrate=1500:aspect=4/3:acodec=mp2
>> -o test.mpg
>>
>>Then I use vcdimager to create the SVCD. Something is strange here, it
>>
>>warns me:
>>
>>++ WARN: mpeg stream will be padded on the fly -- hope that's ok for
>>you!++ WARN: autopadding requires to insert additional 232944 zero
>>bytes into MPEG stream (due to 844 unaligned packets of 845 total)
>>++ WARN: this VCD type should not contain MPEG1 streams
>>
>>Regarding the packet alignment I have no idea how to solve it.
>
>
> To solve it, you must re-write the MPEG container code for mplayer...
>
>
>>I am also surprised about the warning that it's an MPEG1 stream, while
>
>
> You wouldn't be if you read the docs... -of mpeg is for mpeg1, not
> mpeg2.
>
>
>>Available output formats:
>> avi - Microsoft Audio/Video Interleaved
>> mpeg - MPEG-1 system stream format
>
>
>
>>mplayer says:
>>
>>VIDEO: MPEG2 480x576 (aspect 2) 25,000 fps 0,0 kbps ( 0,0
>>kbyte/s)
>
>
> Yes, mplayer has no problem playing an MPEG2 video inside an MPEG1
> container... You won't be so lucky with other players.
>
>
>>Does anybody have an idea why my DVD Player (and also MPlayer) don't
>>like the resulting SVCD?
>
>
> Yes, your DVD player doesn't like it because it isn't really an MPEG2
> stream.
>
>
>>I created some SVCD's with transcode and mpeg2enc which works nice,
>>but it's way too slow to encode from the TV card...
>
>
> First of all, mpeg2enc isn't the only codec available with transcode.
> Using ffmpeg's mpeg2video codec for video will make things about 3X
> faster.
>
> Secondly, you could try ffmpeg... It's supposed to be able to encode
> straight from v4l.
>
> Finally, the way you are currently doing it with mencoder is actually
> just fine. You simply need to dump the video and audio to seperate
> files, and use a program like mplex or tcmplex to combine them into a
> *real* mpeg2 container... It will play in your DVD player, and won't
> need to be padded by vcdimager. The downside is, it's entirely possible
> that the video/audio will be out-of-sync.
>
> I can't really help with sync problems, since all my experience
> has led me to one conclusion: Some encoders keep sync with some
> videos, and some don't... No video encoder on Unix, that I've
> found (eg ffmpeg/ transcode/ mpeg2enc/ mencoder) will consistently
> maintain sync when outputing audio/video to seperate files.
>
>
>>Thanks in advance
>>Torsten
>
>
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