Re: [mpeg2-dev] Playing Live DVBT

[Piyush V. <piy...@gm...>]

Dear Janne,

Thanks a lot for your valuable information.

Finally I have fixed that issue.

I have tried probsize but it was not working before.

The problem was only this that I was using depricted API.

I just change open call from av_open_input_file to avformat_open_input and
it's start respecting "probsize".

where av_open_input_file was overwriting my probsize with default value.

I come to know that with some debugging message and with DEPRICTED_API
warning  message.

Thanks again to everybody and hope above information could help other in
that issue.


Thanks & Regards

Piyush Verma



On Sat, Jun 16, 2012 at 3:22 AM, Janne Grunau <jan...@gr...> wrote:

> Hey,
>
> On 2012-06-16 02:23:08 +0800, Piyush Verma wrote:
> >
> > I was working on DVBT for android.
> >
> > libmpeg2 looks interesting for that application. How ever I found some
> > issue while tyring to use it.
> >
> > I have compiled some test program like extract_mpeg2 and mpeg2dec.
> >
> > When I run extract_mpeg2 /dev/dvb0.dvr0. I am getting contentiously
> message
> > "looks like a video stream, not system stream"
>
> DVB-T uses a MPEG transport stream and extract_mpeg2 seems to expect
> a system stream. This is not going to work well.
>
> > Just for information. Before I was trying ffmpeg but the problem there I
> > got is av_open_input_file takes approx 12 to 15 sec. which is very long.
>
> av_open_input_file() with default options is optimized for fast random
> file access. It doesn't work well on the dvr device. The biggest
> problem is probably the size of the probe buffer (iirc 5 mega byte).
> Try setting probesize to something more reasonable, 100 kilo byte
> should be safe for SD mpeg2 program.
>
> If you have further question regarding libavcodec/format usage please
> ask on the libav-api mailing list
> https://lists.libav.org/mailman/listinfo/libav-api/
>
> I would recommend using Libav over FFmpeg because the developers
> caring about Arm and embedded systems are in the Libav project.
>
> HTH
>
> Janne, Libav developer
>



-- 
Thanks & Regards

Piyush Verma