[FFmpeg-devel] [PATCH] vf_mp: remove blackframe filter wrapper

Stefano Sabatini stefano.sabatini-lala at poste.it
Sat Aug 6 13:38:34 CEST 2011

On date Sunday 2011-07-24 02:44:00 +0300, Ivan Kalvachev encoded:
> On 7/18/11, Stefano Sabatini <stefano.sabatini-lala at poste.it> wrote:
> > Now there are some differences between mplayer/blackframe and
> > lavfi/blackframe, but I don't feel like I want to debug MPlayer to
> > understand what's the difference, and mp=blackframe is not working at
> > all, so I see no point at keeping it.
> No objections about the test and the removal.
> However the difference is puzzling to me.
> It seems that we have
> 012345678
> IPII_IPPI - FFplay
> If you take a look of the pts in the ffplay, you will see that pts
> advances by 33/34, except on the place where the missing P frame is,
> there it have duration of 67.

> What is the format of the test file? (avi have repeat frames of size
> 0, so this is the first thing I thought of).

$ ffprobe slow.flv
[flv @ 0x94843e0] Estimating duration from bitrate, this may be inaccurate
Input #0, flv, from 'slow.flv':
  Duration: 00:03:58.15, start: 0.000000, bitrate: 56 kb/s
    Stream #0.0: Video: flv, yuv420p, 320x240, 29.97 tbr, 1k tbn, 1k tbc
    Stream #0.1: Audio: mp3, 22050 Hz, mono, s16, 56 kb/s

I can send you the file if you want to inspect it.
FFmpeg = Formidable Fabulous Mastodontic Power Exxagerate Gem

More information about the ffmpeg-devel mailing list