Date: Sat, 11 Sep 1999 18:21:29 -0400 From: Randall Hopper <aa8vb@ipass.net> To: thomas@hentschel.net Cc: multimedia@FreeBSD.ORG Subject: Re: fxtv MPEG-audio encoding problems - mplex Message-ID: <19990911182129.A92181@ipass.net> In-Reply-To: <199909090658.XAA02027@gate.hentschel.net>; from thomas@hentschel.net on Thu, Sep 09, 1999 at 12:03:51AM -0700 References: <19990908213139.A61803@ipass.net> <199909090658.XAA02027@gate.hentschel.net>
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thomas@hentschel.net:
|got over that hump, now that the frame rate works I'm determined to
|make the mpg encoding work. The video part works great, however the
|audio part is still giving trouble. If I try encoding in mp3, the
|following happens (on the console with -debug subproc) :
|
|::EXEC:: mplex test.mpg test.mp3 test.mps
...
|***************************************************************
|* MPEG1/SYSTEMS Multiplexer *
...
|* Release 1.1 (06.06.95) *
|***************************************************************
|
|File test.mpg is a 11172-2 Video stream.
|File test.mp3 is a 11172-3 Audio stream.
...
|Scanning Audio stream for access units information.
|Segmentation fault - core dumped
|::STATUS:: 139
|
|Command Failed:
| mplex test.mpg test.mp3 test.mps
|Conversion Aborted.
Ouch. mplex bug.
|What strikes me as odd is that 24.000 frames/sec -- I set it to 10
|frames/sec in the dialog.
That's normal. To create an MPEG-1 video stream, mpeg_encode requires the
input frames to be in one of a handful of acceptable frame rates. So after
capturing at 10, Fxtv uses a simple-minded algorithm to adjust the frame
rate to a supported rate at or about the captured rate.
|If I do encoding with mp2, the conversion finishes ok, but playing with
|mtv or a ~doze player displays the video correctly, but the sound is just
|a short *blop.
I usually use MP2. From your experience, it looks like mplex doesn't
reliably support MP3. I don't understand the short *blop.
|When doing just audio recording, both mp2 and mp3 are ok, this makes me
|think that the problem lies somewhere in mplex. I went thru the (somewhat
|sparse) documentation of mplex, couldn't find anything useful....
|any idea ??
Hmm. I assume your MP2 plays just fine with mpg123 or your favorite MPEG
audio player?
Try these capture parameters and see what you get:
Target: MPEG Ready
Size: 320x240
ImgCapFmt: IYUV
Speed: 15fps
ImgEncFmt: YUV
AudFmt: 44KHz 16-bit stereo enabled
AudEncFmt: MPEG-2
Cleanup: Yes
It'll generate a .sh script (e.g. my-video.sh). Run that script.
You can uncheck Cleanup to force it to leave the intermediate files around.
|Thanks for all the help so far, hope I didn't hit the annoyance
|threshold yet --
Ok, good. Hope we can get you going.
Randall
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