[libav-api] Resolution Change

Luca Barbato lu_zero at gentoo.org
Sun Apr 24 12:03:28 CEST 2011

On 4/24/11 10:15 AM, Stefan Lederer wrote:
> Hello,


> I'm developing adaptive dynamic http streaming over http (DASH) using VLC
> for my master thesis at university. In this scenario I receive segmented MP4
> content which is downloaded via http . This content can have different
> bitrates (which works quite well) and also different resolution (that's the
> problem). My problem is that the VLC player crashes when I switch from one
> resolution content (e.g. 720p) to another resolution (e.g. 1080p) during
> playback. The problem occurs in h264.c in the
> ff_h264_check_intra4x4_pred_mode function which the error: top block
> unavailable for requested intra4x4 mode.

Could you please craft a minimal testcase using libav only? and/or 
provide a full backtrace?

> How can I tell ffmpeg that the resolution of the content has changed during
> playback? Is this even possible?

It seems working correctly with mpegts as container so I'm not sure yet 
where the problem is.


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