[FFmpeg-devel] flashsvenc.c - sampling block size too low

[Jason Askew]

Two pass encoding is working:

First pass file size is 5266kB, second pass is 1596kB:


C:\>ffmpeg -pass 1 -passlogfile pass1 -r 15 -g 150 -vcodec fl
ashsv -y -i "input.avs" "example.flv"
FFmpeg version SVN-rUNKNOWN, Copyright (c) 2000-2007 Fabrice Bellard, et al.
  configuration: --extra-cflags=-mno-cygwin -mms-bitfields
--extra-ldflags=-Wl,--add-stdcall-alias --disable-shared --en
able-static --enable-pp --enable-avisynth --enable-memalign-hack
--enable-zlib --enable-gpl
  libavutil version: 49.4.0
  libavcodec version: 51.40.4
  libavformat version: 51.12.1
  built on May  8 2007 15:50:25, gcc: 3.4.2 (mingw-special)
Input #0, avs, from 'input.avs':
  Duration: 00:01:46.6, start: 0.000000, bitrate: 0 kb/s
  Stream #0.0: Video: rawvideo, bgr24, 640x480, 110591 kb/s, 15.00 fps(r)
Output #0, flv, to 'example.flv':
  Stream #0.0: Video: flashsv, bgr24, 640x480, q=2-31, pass 1, 200
kb/s, 15.00 fps(c)
Stream mapping:
  Stream #0.0 -> #0.0
Press [q] to stop encoding
frame= 1599 fps=  2 q=0.0 Lsize=    5291kB time=106.6 bitrate= 406.6kbits/s
video:5266kB audio:0kB global headers:0kB muxing overhead 0.477947%

C:\>ffmpeg -pass 2 -passlogfile pass1 -r 15 -g 150 -vcodec fl
ashsv -y -i "input.avs" "example.flv"
FFmpeg version SVN-rUNKNOWN, Copyright (c) 2000-2007 Fabrice Bellard, et al.
  configuration: --extra-cflags=-mno-cygwin -mms-bitfields
--extra-ldflags=-Wl,--add-stdcall-alias --disable-shared --en
able-static --enable-pp --enable-avisynth --enable-memalign-hack
--enable-zlib --enable-gpl
  libavutil version: 49.4.0
  libavcodec version: 51.40.4
  libavformat version: 51.12.1
  built on May  8 2007 15:50:25, gcc: 3.4.2 (mingw-special)
Input #0, avs, from 'input.avs':
  Duration: 00:01:46.6, start: 0.000000, bitrate: 0 kb/s
  Stream #0.0: Video: rawvideo, bgr24, 640x480, 110591 kb/s, 15.00 fps(r)
Output #0, flv, to 'example.flv':
  Stream #0.0: Video: flashsv, bgr24, 640x480, q=2-31, pass 2, 200
kb/s, 15.00 fps(c)
Stream mapping:
  Stream #0.0 -> #0.0
[flashsv @ 006FD290] count is 10.
Press [q] to stop encoding
frame= 1599 fps=105 q=0.0 Lsize=    1595kB time=106.6 bitrate= 122.6kbits/s
video:1570kB audio:0kB global headers:0kB muxing overhead 1.603128%

First pass is -slow-.  Really slow.  There are optimizations to be
had, yet, however.

So, what now?  Wait until everything is more optimized or start
submitting the patches to get it this far?