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

[Andoni Morales]

2009/8/6 Albert Costa <costa_albert at yahoo.fr>:
> 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.
The FFmpeg 0.5 release is from March 3, 2009 [1], so you are probably
using a different version. You can fetch precompiled binaries from the
videohelp site[2.

[1]http://ffmpeg.org/RELEASE
[2]http://www.videohelp.com/tools/ffmpeg




> 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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>
>
>
> --
> Andoni Morales Alastruey
>
> LongoMatch:The Digital Coach
> http://www.longomatch.ylatuya.es
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-- 
Andoni Morales Alastruey

LongoMatch:The Digital Coach
http://www.longomatch.ylatuya.es