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Different encoding behavior gstreamer/ffmpeg

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Albert Costa

Different encoding behavior gstreamer/ffmpeg

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,

(my config: XP with winbuild-0.10.4)

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Andoni Morales

Re: Different encoding behavior gstreamer/ffmpeg

2009/8/6 Albert Costa <[hidden email]>:

> 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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> _______________________________________________
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> [hidden email]
> https://lists.sourceforge.net/lists/listinfo/gstreamer-devel
>
>

--
Andoni Morales Alastruey

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

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Albert Costa

Re : Different encoding behavior gstreamer/ffmpeg

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,

De : Andoni Morales <[hidden email]>
À : Discussion of the development of GStreamer <[hidden email]>
Envoyé le : Jeudi, 6 Août 2009, 16h55mn 21s
Objet : Re: [gst-devel] Different encoding behavior gstreamer/ffmpeg

2009/8/6 Albert Costa <[hidden email]>:

Andoni Morales

Re: Re : Different encoding behavior gstreamer/ffmpeg

2009/8/6 Albert Costa <[hidden email]>:
> 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 <[hidden email]>
> À : Discussion of the development of GStreamer
> <[hidden email]>
> Envoyé le : Jeudi, 6 Août 2009, 16h55mn 21s
> Objet : Re: [gst-devel] Different encoding behavior gstreamer/ffmpeg
>
> 2009/8/6 Albert Costa <[hidden email]>:
>> 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
>>
>>
>> ------------------------------------------------------------------------------
>> Let Crystal Reports handle the reporting - Free Crystal Reports 2008
>> 30-Day
>> trial. Simplify your report design, integration and deployment - and focus
>> on
>> what you do best, core application coding. Discover what's new with
>> Crystal Reports now. http://p.sf.net/sfu/bobj-july
>> _______________________________________________
>> gstreamer-devel mailing list
>> [hidden email]
>> https://lists.sourceforge.net/lists/listinfo/gstreamer-devel
>>
>>
>
>
>
> --
> Andoni Morales Alastruey
>
> LongoMatch:The Digital Coach
> http://www.longomatch.ylatuya.es
>
> ------------------------------------------------------------------------------
> Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day
> trial. Simplify your report design, integration and deployment - and focus
> on
> what you do best, core application coding. Discover what's new with
> Crystal Reports now. http://p.sf.net/sfu/bobj-july
> _______________________________________________
> gstreamer-devel mailing list
> [hidden email]
> https://lists.sourceforge.net/lists/listinfo/gstreamer-devel
>
>
> ------------------------------------------------------------------------------
> Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day
> trial. Simplify your report design, integration and deployment - and focus
> on
> what you do best, core application coding. Discover what's new with
> Crystal Reports now. http://p.sf.net/sfu/bobj-july
> _______________________________________________
> gstreamer-devel mailing list
> [hidden email]
> https://lists.sourceforge.net/lists/listinfo/gstreamer-devel
>
>

Albert Costa

Re : Re : Different encoding behavior gstreamer/ffmpeg

Hi,

all the win32 builds of ffmpeg I found prior to 0.5 release were working fine for generating mpg2ts files. The problem seems to have appeared in latest release, that's a pittyfull regression...

Regards,

De : Andoni Morales <[hidden email]>
À : Discussion of the development of GStreamer <[hidden email]>
Envoyé le : Jeudi, 6 Août 2009, 19h17mn 39s
Objet : Re: [gst-devel] Re : Different encoding behavior gstreamer/ffmpeg

2009/8/6 Albert Costa <[hidden email]>:
> 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