[gst-devel] Re : Different encoding behavior gstreamer/ffmpeg

[Albert Costa]

Thanks Andoni,
with that, I've been able to retrieve a win32-compiled version of ffmpeg using same code version; and the result is now that the file generated by ffmpeg also doesn't play with VLC :-)... The exe version I tried before was from april2008, so a lot has changed since.
Well, gst and ffmpeg do have same behavior now on my machine. Unfortunately not the one I expect... But encoding with ffmpeg does show me some errors, so at least I've a lead to follow. If I can fix it with ffmpeg, I guess I can fix it with gst.
Regards,
Al



________________________________
De : Andoni Morales <ylatuya at gmail.com>
À : Discussion of the development of GStreamer <gstreamer-devel at lists.sourceforge.net>
Envoyé le : Jeudi, 6 Août 2009, 16h55mn 21s
Objet : Re: [gst-devel] Different encoding behavior gstreamer/ffmpeg

2009/8/6 Albert Costa <costa_albert at yahoo.fr>:
> Hi all,
> in my attemps to use gstreamer for dealing with mpeg2 ts files, I've ended
> up with following issues:
> I'm willing to generate mpg2ts files that will be used for analysis whilst
> beeing generated (this is what ts is good for...). I also need to seek for a
> specific frame in the file (using external code).
> I tried following things:
> gst-launch filesrc location=myfile.avi ! decodebin ! ffmpegcolorspace !
> ffenc_mpeg2video quantizer=4 gop-size=1 ! ffmux_mpegts ! filesink
> location=myfile.ts
> This generates a mpg2ts file that I can read with gstreamer, windows media
> player (with haali splitter codec), but not VLC...
> I tried similar thing using ffmpeg:
> ffmpeg -y -i myfile.avi -copyts -an -vcodec mpeg2video -intra -qscale 4 -f
> mpegts myfile.ts
> This should generate the same output, but it does not. Here I can read the
> output file with all media players.
> More than that, using command line to seek&extract a frame:
> ffmpeg -y -ss 0:4:0.0 -i myfile.ts -vframes 1 -f image2 test.jpg will seek
> (almost) correctly and get the frame with ffmpeg-generated file, but not
> with gstreamer-generated file.
> I thought that gstreamer ffdec/mux plugins were based on ffmpeg, but it
> seems it doesn't have correct behavior. Has anyone experienced the same
> problems? Or could reproduce it? How can I know which version of ffmpeg the
> gst plugins are based on? Looks like the gst formating is not so
> well-formed...
> I'm really stuck with that problem, and would like to get over it, so any
> hint is welcomed!
> Best Regards,
> Al
> (my config: XP with winbuild-0.10.4)
The 0.10.4 WinBuild release uses the official FFmpeg 0.5 release.
Here is the list of the packages used to build GStreamer WinBuild
http://code.google.com/p/ossbuild/source/browse/trunk/Libraries/Packages/ReadMe.txt

Andoni
>
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