AW: AW: Change aspect ratio without transcoding?

Martijn Grendelman martijn at iphion.nl
Wed Apr 4 05:01:39 PDT 2012


On 04-04-12 13:11, Bernhard Graaf wrote:
> have you tried something like 'videoscale'? I've never used this element
> before, but it's seems to help for fixing your problem.
> In other case you should decode/encode the stream into the needed format.
> Sorry.....

Well, videoscale obviously should do the trick, except that it only works
on raw video, meaning I have to transcode.

What I am looking for, is a way to change (overwrite) certain bits in a
transport stream. More specific: the aspect ratio of the video is present
in the sequence header of the PES payload packets of the video stream, I
have been told.

So, I wonder if that can be manipulated without demuxing the stream. I
assume no such functionality is present in Gstreamer. Unfortunately, this
is all I know about the matter, and I just barely understand myself what I
wrote here, so I guess I'm stuck ;-) Thanks.

Best regards,
Martijn Grendelman









> -----Ursprüngliche Nachricht-----
> Von: gstreamer-devel-bounces+bernhard.graaf=gmx.de at lists.freedesktop.org
> [mailto:gstreamer-devel-bounces+bernhard.graaf=gmx.de at lists.freedesktop.org]
> Im Auftrag von Martijn Grendelman
> Gesendet: Mittwoch, 4. April 2012 12:41
> An: gstreamer-devel at lists.freedesktop.org
> Betreff: Re: AW: Change aspect ratio without transcoding?
> 
> Hi,
> 
>> which sink-object you are using? Xvimagesink has a parameter for that 
>>
>> g_object_set (G_OBJECT (sinkobjectname), "force-aspect-ratio", 1, NULL);
> 
> Ah, sorry, I should have mentioned that. We don't actually play the video
> with Gstreamer. We're using a tcpserversink to serve the stream to our
> distribution network.
> 
> I'd like the AR of the video to be 16:9 before that. Unfortunately, the
> input (an analog-to-h.264 encoder) only supports 4:3 for the available
> signal, even though the source is 16:9.
> 
> Best regards,
> Martijn Grendelman
> 
> 
> 
> 
> 
>>
>> -----Ursprüngliche Nachricht-----
>> Von: gstreamer-devel-bounces+bernhard.graaf=gmx.de at lists.freedesktop.org
>>
> [mailto:gstreamer-devel-bounces+bernhard.graaf=gmx.de at lists.freedesktop.org]
>> Im Auftrag von Martijn Grendelman
>> Gesendet: Mittwoch, 4. April 2012 10:21
>> An: gstreamer-devel at lists.freedesktop.org
>> Betreff: Change aspect ratio without transcoding?
>>
>> Hi,
>>
>> I have a feeling that I'm on the wrong track here, but I'm going to ask
>> anyway.
>>
>> I have a MPEG-TS, containing H.264 video, in 4:3 aspect ratio. I'd like to
>> stretch the video to 16:9. Is that possible without transcoding, perhaps
>> by only remuxing?
>>
>> Best regards,
>> Martijn Grendelman
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> 
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