openharmony/third_party_ffmpeg
1
0
Fork 0
mirror of https://gitee.com/openharmony/third_party_ffmpeg synced 2024-11-28 05:30:34 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

update

Browse Source 
Originally committed as revision 589 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Fabrice Bellard 2002-05-25 22:26:48 +00:00
parent 773a21b8fe
commit 360d33c9b6
2 changed files with 23 additions and 30 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

25
doc/README.tech
View File

@ -27,20 +27,23 @@ Video:
vectors. Currently, only fcode = 1 is used for both H263/MPEG1. Half
pel vectors are used.
I also plan to improve the bitrate control which is too simplistic.
Audio:
-----
- I rewrote the mpeg audio layer 2 compatible encoder from scratch. It
is one of the simplest encoder you can imagine (800 lines of C code
!). It is also one of the fastest because of its simplicity. There
are still some problems of overflow. A minimal psycho acoustic model
could be added. Currently, stereo is supported, but not joint
stereo.
- The mpeg audio layer 2 compatible encoder was rewritten from
scratch. It is one of the simplest encoder you can imagine (800
lines of C code !). It is also one of the fastest because of its
simplicity. There are still some problems of overflow. A minimal
psycho acoustic model could be added. Currently, stereo is
supported, but not joint stereo.
- I rewrote the AC3 audio encoder from scratch. It is fairly naive,
but the result are quiet interesting at 64 kbit/s. It includes
extensions for low sampling rates used in some Internet
- The AC3 audio encoder was rewritten from scratch. It is fairly
naive, but the result are quiet interesting at 64 kbit/s. It
includes extensions for low sampling rates used in some Internet
formats. Differential and coupled stereo is not handled. Stereo
channels are simply handled as two mono channels.
- The mpeg audio layer 3 decoder was rewritten from scratch. It uses
only integers and can be 16 bit precision for the synthesis filter
at the expense of a slight precision loss. A slower bit exact mode
is available too for compliance testing.

28
doc/TODO
View File

@ -3,26 +3,16 @@ ffmpeg TODO list:
(in approximate decreasing priority order)
Short term glantau's fixes:
- regression tests (done).
- mpeg1/2 decode fix (unfortunately not much speed increase) (done)
- fix WORDS_BIGENDIAN issue (done)
- remove win project files (done)
- remove sub_xxx functions (done)
- mpeg2 transport stream support (decoding done)
- improved auto guess for formats (api change again in demux) (done)
- fix mpeg format tracking + handle frame rate change (done)
- suppress strlcpy (done)
- split mux/demux functions. (done)
- use av_new_stream() (partially done)
- reconstruct mpeg header frame rate in telecine case so that we do
not need to ifner the real rate if it is not possible.
- remove unused DCT code.
Short term fixes:
- mpeg audio fix
- AV sync fix (new api for demux)
- RTP streaming support in ffserver
- ffserver fix
- fix stream selection (aka map) syntax. Start stream numbers at 1 in
listing. Find a syntax for stream ids (such as TS pids).
- reconstruct mpeg header frame rate in telecine case so that we do
not need to infer the real rate if it is not possible.
- remove unused DCT code.
- AV sync fix
- RTP/RTSP streaming support in ffserver and in libav
- minimal support of video in ffplay
Planned in next releases: