FFmpeg

115468 Commits

37 Branches

400 Tags

483 MiB

Tag: Branch: Tree: 442e94e5e4

Commit Graph

Author	SHA1	Message	Date
Andreas Rheinhardt	bc109a53c7	avcodec/mpegpicture: Move mb_var, mc_mb_var and mb_mean to MpegEncCtx These tables are only used by encoders and only for the current picture; ergo they need not be put into the picture at all, but rather into the encoder's context. They also don't need to be refcounted, because there is only one owner. In contrast to this, the earlier code refcounts them which incurs unnecessary overhead. These references are not unreferenced in ff_mpeg_unref_picture() (they are kept in order to have something like a buffer pool), so that several buffers are kept at the same time, although only one is needed, thereby wasting memory. The code also propagates references to other pictures not part of the pictures array (namely the copy of the current/next/last picture in the MpegEncContext which get references of their own). These references are not unreferenced in ff_mpeg_unref_picture() (the buffers are probably kept in order to have something like a pool), yet if the current picture is a B-frame, it gets unreferenced at the end of ff_mpv_encode_picture() and its slot in the picture array will therefore be reused the next time; but the copy of the current picture also still has its references and therefore these buffers will be made duplicated in order to make them writable in the next call to ff_mpv_encode_picture(). This is of course unnecessary. Finally, ff_find_unused_picture() is supposed to just return any unused picture and the code is supposed to work with it; yet for the vsynth*-mpeg4-adap tests the result depends upon the content of these buffers; given that this patchset changes the content of these buffers (the initial content is now the state of these buffers after encoding the last frame; before this patch the buffers used came from the last picture that occupied the same slot in the picture array) their ref-files needed to be changed. This points to a bug somewhere (if one removes the initialization, one gets uninitialized reads in adaptive_quantization in ratecontrol.c). Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>	3 years ago
Michael Niedermayer	adfde9a646	avformat/avienc: Fix wrongly placed comment Signed-off-by: Michael Niedermayer <michaelni@gmx.at>	10 years ago
Christophe Gisquet	8d02a55b1b	tests: add a third, 34x34, target This should exercise the corner cases of numerous codecs. Signed-off-by: Michael Niedermayer <michaelni@gmx.at>	11 years ago

Author

SHA1

Message

Date

Andreas Rheinhardt

bc109a53c7

avcodec/mpegpicture: Move mb_var, mc_mb_var and mb_mean to MpegEncCtx

These tables are only used by encoders and only for the current picture;
ergo they need not be put into the picture at all, but rather into
the encoder's context. They also don't need to be refcounted,
because there is only one owner.

In contrast to this, the earlier code refcounts them which
incurs unnecessary overhead. These references are not unreferenced
in ff_mpeg_unref_picture() (they are kept in order to have something
like a buffer pool), so that several buffers are kept at the same
time, although only one is needed, thereby wasting memory.

The code also propagates references to other pictures not part of
the pictures array (namely the copy of the current/next/last picture
in the MpegEncContext which get references of their own). These
references are not unreferenced in ff_mpeg_unref_picture() (the
buffers are probably kept in order to have something like a pool),
yet if the current picture is a B-frame, it gets unreferenced
at the end of ff_mpv_encode_picture() and its slot in the picture
array will therefore be reused the next time; but the copy of the
current picture also still has its references and therefore
these buffers will be made duplicated in order to make them writable
in the next call to ff_mpv_encode_picture(). This is of course
unnecessary.

Finally, ff_find_unused_picture() is supposed to just return
any unused picture and the code is supposed to work with it;
yet for the vsynth*-mpeg4-adap tests the result depends upon
the content of these buffers; given that this patchset
changes the content of these buffers (the initial content is now
the state of these buffers after encoding the last frame;
before this patch the buffers used came from the last picture
that occupied the same slot in the picture array) their ref-files
needed to be changed. This points to a bug somewhere (if one removes
the initialization, one gets uninitialized reads in
adaptive_quantization in ratecontrol.c).

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

3 years ago

Michael Niedermayer

adfde9a646

avformat/avienc: Fix wrongly placed comment

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

10 years ago

Christophe Gisquet

8d02a55b1b

tests: add a third, 34x34, target

This should exercise the corner cases of numerous codecs.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

11 years ago

3 Commits (442e94e5e476710dfbb9f611a86ac3c86156394c)