Re: [Mjpeg-users] mplex not recognizing mpeg1 from mencoder

[Steven M. S. <sm...@2B...>]

On Thu, 1 Jan 2004, Brian J. Murrell wrote:

> I am using mencoder (libavcodec in reality I guess) to create an mpeg1

	Hmmm, I knew ffmpeg had mpeg1 encoding capability (from libavcodec)
	and it can, if you say the right magic words, produce MPEG1
	ES (Elemental Stream) files.

	I am fairly sure that the problem is that mencoder produces AVI files 
	- they're already "muxed" and definitely not MPEG1 ES files and that 
	is why mplex can't recognize them.  

>    INFO: [mplex] mplex version 2.2.2 ($Date: 2003/05/13 20:27:15 $)
> **ERROR: [mplex] File test.mpeg1 unrecogniseable!
>    INFO: [mplex] File test.mp3 looks like an MPEG Audio stream.
> **ERROR: [mplex] Unrecogniseable file(s)... exiting.

	Right - the file's already multiplexed, into an avi stream.   The
	video portion is MPEG1 but it's inside a container format and mplex
	doesn't mplex avi files.

> Is there anything I can do to discover more about what mplex does not
> like about this mpeg1 file?
	
	If you're determined to avoid mpeg2enc then you might use 'ffmpeg'
	to do the encoding - it can produce ES files rather than AVI files.

	Something like this (suitably modified for your situation of course)
	might work better.   I was testing the mpeg2 encoding capability
	so for mpeg1 you'd change the 'mpeg2video' to be 'mpeg1video' and
	of course set the bitrate and bufsize down to reasonable values:

ffmpeg -f yuv4mpegpipe -i susi_120.y4m -b 7000 -ilme -ildct \
    -aspect 4/3 \
    -top 1 -g 15 -maxrate 7500 -f mpeg1video -vcodec mpeg2video \
    -bufsize 1840  -y xxx

	MPEG1's most commonly used for VCD (352x240) - is that what you're
	doing?

	Cheers,
	Steven Schultz