[FFmpeg-devel] [PATCH] Copy width/height for subtitle streams in ffmpeg

[David Conrad]

On Jan 11, 2009, at 4:44 AM, Michael Niedermayer wrote:

> On Sun, Jan 11, 2009 at 02:12:31AM -0500, David Conrad wrote:
>> Hi,
>>
>> This copies stream width/height for -scodec copy in ffmpeg, useful  
>> for
>> mov/mp4 timed text and ignored for about every other subtitle codec.
>>
>
>> commit 60039bb8c900ef4562e9ea4d5f9b0de2bdfa713f
>> Author: David Conrad <davedc at Kozue.local>
>> Date:   Sun Jan 11 02:10:22 2009 -0500
>>
>>    Copy width/height for subtitle streams
>
> what does width/height mean for these subtitles?

Essentially, the same thing it would mean if you consider the  
subtitles a transparent video track overlaid on top of the normal  
video track.

For example, if you have a video 320x240 and subs 320x120, the subs  
would be on the top half of the video even if the actual positioning  
of the subs is aligned with the bottom.

Or if you had subs 320x320, the subs could be underneath the actual  
video.

-David