Re: [mpeg2-dev] Playing Live DVBT

[Janne G. <jan...@gr...>]

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