[FFmpeg-cvslog] r25385 - trunk/libavformat/mpegenc.c

Michael Niedermayer michaelni
Thu Oct 7 12:33:43 CEST 2010


On Wed, Oct 06, 2010 at 08:12:27PM -0700, Baptiste Coudurier wrote:
> On 10/6/10 7:31 PM, Michael Niedermayer wrote:
> > On Wed, Oct 06, 2010 at 07:05:22PM -0700, Baptiste Coudurier wrote:
> >> On 10/06/2010 06:57 PM, michael wrote:
> >>> Author: michael
> >>> Date: Thu Oct  7 03:57:39 2010
> >>> New Revision: 25385
> >>>
> >>> Log:
> >>> Warn if muxing mpeg ps is attempted without a VBV buffer size.
> >>>
> >>> Modified:
> >>>     trunk/libavformat/mpegenc.c
> >>>
> >>> Modified: trunk/libavformat/mpegenc.c
> >>> ==============================================================================
> >>> --- trunk/libavformat/mpegenc.c	Thu Oct  7 03:57:35 2010	(r25384)
> >>> +++ trunk/libavformat/mpegenc.c	Thu Oct  7 03:57:39 2010	(r25385)
> >>> @@ -367,8 +367,10 @@ static int mpeg_mux_init(AVFormatContext
> >>>               stream->id = mpv_id++;
> >>>               if (st->codec->rc_buffer_size)
> >>>                   stream->max_buffer_size = 6*1024 + st->codec->rc_buffer_size/8;
> >>> -            else
> >>> +            else{
> >>> +                av_log(ctx, AV_LOG_WARNING, "VBV buffer size not set, muxing may fail\n");
> >>>                   stream->max_buffer_size = 230*1024; //FIXME this is probably too small as default
> >>> +            }
> >>
> >> Humm, this will warn for every VBR encode. I'm not sure at all that is  
> >> wanted.
> > 
> > VBR has buffers too, so it needs a buffer size too
> 
> Hummm, but the encoder does not set rc_buffer_size when encoding VBR ?

it does, it even requires it in some cases.
example:
 -vb 30MB -minrate 10MB -maxrate 50MB -bt 50MB
(minrate != maxrate thus not CBR)
[mpeg1video @ 0x18607b0] a vbv buffer size is needed, for encoding with a maximum bitrate

[...]
-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Many that live deserve death. And some that die deserve life. Can you give
it to them? Then do not be too eager to deal out death in judgement. For
even the very wise cannot see all ends. -- Gandalf
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 198 bytes
Desc: Digital signature
URL: <http://lists.mplayerhq.hu/pipermail/ffmpeg-cvslog/attachments/20101007/dbc86dde/attachment.pgp>



More information about the ffmpeg-cvslog mailing list