- r1299
Improve CRF initial QP selection, fix get_qscale bug
If qcomp=1 (as in mb-tree), we don't need ABR_INIT_QP.
get_qscale could give slightly weird results with still images
- r1298
Print more accurate error message if dump_yuv fails
- r1297
Reduce memory usage of b-adapt 2 trellis
Also fix a minor bug where the algorithm ignored the last frame in the trellis.
- r1296
Make B-pyramid spec-compliant
The rules of the specification with regard to picture buffering for pyramid coding are widely ignored.
x264's b-pyramid implementation, despite being practically identical to that proposed by the original paper, was technically not compliant.
Now it is.
Two modes are now available:
1) strict b-pyramid, while worse for compression, follows the rule mandated by Blu-ray (no P-frames can reference B-frames)
2) normal b-pyramid, which is like the old mode except fully compliant.
This patch also adds MMCO support (necessary for compliant pyramid in some cases).
MB-tree still doesn't support b-pyramid (but will soon).
- r1295
Add missing free for nal_buffer
Fixes a memory leak.
- r1294
sync yasm macros to ffmpeg
- r1293
eliminate some divisions
- r1292
Fix glitches with slow-firstpass + weightb + multiref + 2pass
Bug in r1277
- r1291
Simplify some code in b-adapt 2's trellis
- r1290
Fix a very rare integer overflow in slicetype analysis
Caused an assert failure when it occurred.
Bug is as old as adaptive B-frames.
- r1289
Reduce the aggressiveness of 2-pass VBV
Now that B-frames are properly covered, we don't have to be as aggressive.
This eliminates some issues with skyrocketing QPs in B-frames in 2-pass VBV.
- r1288
Fix regression: disable flash detection without B-frames
- r1287
change all dct arrays to 1d.
the C standard doesn't allow you to iterate 1-dimensionally over 2d arrays, and nothing other than the dsp functions themselves cares about the 2dness of dct.
this fixes a miscompilation in x264_mb_optimize_chroma_dc.
- r1286
Add row-based VBV for B-frames
While B-frames still aren't explicitly covered by ratecontrol, this should resolve issues of VBV underflows due to larger-than-expected B-frames.
- r1285
Improve VBV, fix bug in 2-pass VBV introduced in MB-tree
Bug caused AQ'd row/frame costs to not be calculated (and thus caused underflows).
Also make VBV more aggressive with more threads in 2-pass mode.
Finally, --ratetol now affects VBV aggressiveness (higher is less aggressive).
- r1284
Optimize exp2fix8
Slightly faster and more accurate rounding.
- r1283
Avoid scenecuts in flashes and similar situations
"Flashes" are defined as any scene which lasts a very short period before a previous scene returns.
A common example of this is of course a camera flash.
Accordingly, look ahead during scenecut analysis and rule out the possibility of certain frames being scenecuts.
Also handles cases of tons of short scenes in sequence and avoids making those scenecuts as well.
Can only catch flashes of 1 frame in length with b-adapt 1.
With b-adapt 2, can catch flashes of length --bframes.
Speed cost should be negligible.
- r1282
Fix bug where x264 generated non-compliant bitstreams with insane SAR values
- r1281
rm msvc project files and related ifdefs
- r1280
SSE4 version of 4x4 idct
27->24 clocks on Nehalem.
This is really just an excuse to use "movsd" in a real function.
Add some comments to subsum-related macros in x86util.
- r1279
Constrained intra prediction support
Enable with --constrained-intra. Significantly reduces compression, but required for the base layer of SVC encodes and maybe some other use-cases.
Commit sponsored by a media streaming company that wishes to remain anonymous.
- r1278
Slightly improve non-RD p8x8 mode decision
Subpartition costs are effectively zero in CABAC if sub-8x8 search is off.
- r1277
Reorder reference frames optimally on second pass
About +0.1-0.2% compression at normal bitrates, up to +1% at very low bitrates.
Only works if the first pass uses the same number of refs as the second (i.e. not with fast first pass).
Thus, only worthwhile at insanely slow speeds: as such, enable slow-firstpass by default with preset placebo.
Note that this changes the stats file format!
- r1276
Fix typo in ratecontrol_summary
- r1275
Clip log2_max_frame_num
It's still much higher than it needs to be, but that will be fixed with the upcoming MMCO patch.
Also make sure we don't write too large a frame_num or poc in slice header.
- r1274
Fix some issues with 3-pass statsfile handling
The value of i_frame during encoder_close was incorrect.
- r1273
Fix ctrl-C termation message with few frames encoded
- r1272
Add support for single-frame VBV, improve compliance
This allows both constant-framesize and capped-framesize encoding.
Literal constant framesize isn't actually supported yet due to the lack of
filler support.
Example with 30fps video: --vbv-bufsize 200 --vbv-maxrate 6000 will ensure that
no frame is ever larger than 200 kilobits.
One example use-case of this is for zero-delay streaming where bandwidth costs
need to be minimized. If every frame is smaller than 200 kilobits and the
client has a 6 megabit connection, every single frame can be instantly sent
to the client and handled without any decoder-side buffer.
Fix a mistake in VBV calculation--this may have caused the VBV to be slightly
non-compliant in some situations without x264 realizing it.
Add primitive prediction handling for rows with quantizers lower than their
reference. This slightly improves VBV in CBR mode.
Various other minor improvements to VBV, mostly to make single-frame VBV work.
Commit sponsored by a media streaming company that wishes to remain anonymous.
- r1271
Fix 10l in API change
frame_num was set to 1, not 0, for the first frame. This broke spec compliance.
Didn't actually seem to cause any problems though except for breaking decoding on Quicktime.
- r1270
Allow user-set FPS for inputs other than YUV
- r1269
Improve threaded frame handling
Avoid unnecessary cond_wait
- r1268
Attempt to detect miscompilation due to bug in gcc 4.2
I don't know if this bug still affects latest x264, but it can't hurt to try to detect it.
Accordingly refuse to open the encoder if detected.
Apparently VLC (on Windows) has been distributed for some time with a completely
broken x264 due to the use of a completely broken compiler (gcc 4.2). In
particular, the MV costs seem to be calculated incorrectly on win32 when linking
from an application compiled without -ffast-math to an application with
-ffast-math.
I am not entirely certain why this occurs, but the result is, unsurprisingly,
encoding quality that makes MPEG-2 look good, due to the motion search being
completely broken.
- r1267
Really fix encoder_close crash this time
Not-entirely-fixed in r1253.
- r1266
Check for 16x16 partitions masquerading as smaller ones
Saves a few bits when using qpel-RD.
- r1265
Update config.guess/sub; add Snow Leopard support
- r1264
Fix integer overflow in 2-pass VBV
Bug caused slight undersizing in 2-pass mode in some cases.
- r1263
Fix bug with various bizarre commandline combinations and mbtree
Second pass would have mbtree on even though the first pass didn't (and thus encoding would immediately fail).
- r1262
Add intra prediction modes to output stats
Also eliminate some NANs in stat output with intra-only encoding.
Marginal speedup: disable stat calculation if log level is below X264_LOG_INFO.
Various minor cosmetics.
- r1261
Overhaul syntax in muxers.c/matroska.c
The inconsistent syntax in these files has finally come to an end.
- r1260
Major API change: encapsulate NALs within libx264
libx264 now returns NAL units instead of raw data. x264_nal_encode is no longer a public function.
See x264.h for full documentation of changes.
New parameter: b_annexb, on by default. If disabled, startcodes are replaced by sizes as in mp4.
x264's VBV now works on a NAL level, taking into account escape codes.
VBV will also take into account the bit cost of SPS/PPS, but only if b_repeat_headers is set.
Add an overhead tracking system to VBV to better predict the constant overhead of frames (headers, NALU overhead, etc).
- r1259
Add missing fclose for mbtree input statsfile on second pass
Bug report by VFRmaniac
- r1258
Improve progress indicator behavior
Progress indicator will now indicate based on output frame, not input frame.
- r1257
Update yasm configure check
lzcnt apparently requires yasm 0.6.2.
- r1256
Make MV costs global instead of static
Fixes some extremely rare threading race conditions and makes the code cleaner.
Downside: slightly higher memory usage when calling multiple encoders from the same application.
- r1255
Don't print scenecut message multiple times in verbose mode
Occurred mostly with b-adapt 2.
- r1254
Optimize rounding of luma and chroma DC coefficients
Reduce bitrate mostly-losslessly at low quantizers.
In some rare cases, bitrate reduction may be as high as 10%.
Luma rounding optimization (helps much less than chroma) requires trellis.
- r1253
Fix crash if encoder_close is called before delayed frames are flushed
Also no longer flush frames when ctrl-Cing x264, so x264 will close faster.
- r1252
Improve x264 help
Now has three help options: --help, --longhelp, and --fullhelp.
--help only shows the most basic options; most users should not need more than these.
Add usage examples.
Fix typo in a comment.
- r1251
Factor out a redundant RD call in qpel-RD
Fixes a problem that was supposed to be, but didn't, get fully fixed in r1238.
- r1250
Fix RD early-skip
Small quality improvement and speedup, was broken by r1214.
- r1249
Faster CAVLC mb header writing for B macroblocks
- r1248
Compile fixes for pre-ARMv6T2 and/or PIC
- r1247
Change priority handling on some OSs
Instead of setting the lookahead thread to max priority, lower all the other threads' priorities instead.
This is particularly useful when the "max priority" is "realtime", as in Windows, which can cause some problems.
- r1246
Threaded lookahead
Move lookahead into a separate thread, set to higher priority than the other threads, for optimal performance.
Reduces the amount that lookahead bottlenecks encoding, greatly increasing performance with lookahead-intensive settings (e.g. b-adapt 2) on many-core CPUs.
Buffer size can be controlled with --sync-lookahead, which defaults to auto (threads+bframes buffer size).
Note that this buffer is separate from the rc-lookahead value.
Note also that this does not split lookahead itself into multiple threads yet; this may be added in the future.
Additionally, split frames into "fdec" and "fenc" frame types and keep the two separate.
This split greatly reduces memory usage, which helps compensate for the larger lookahead size.
Extremely special thanks to Michael Kazmier and Alex Giladi of Avail Media, the original authors of this patch.
- r1245
Force a link error in case of incompatible API
This is because the number of bug reports due to miscompiled ffmpeg builds is reaching critical mass.
The name of x264_encoder_open is now #defined based on the current X264_BUILD.
Note that this changes the calling convention required for dlopen, but not for ordinary calls to x264_encoder_open.
- r1244
Get rid of "CBR" descriptor from qcomp
Though technically accurate in some vague way, I have never actually seen this
option used correctly, rather it has been used by hundreds of people who can't
read the documentation and believe that qcomp=0 is what should be used for CBR
encoding.
- r1243
Faster me=tesa
But it still spends all too much time in me_search_ref rather than asm.
- r1242
Multi-slice encoding support
Slicing support is available through three methods (which can be mixed):
--slices sets a number of slices per frame and ensures rectangular slices (required for Blu-ray). Overridden by either of the following options:
--slice-max-mbs sets a maximum number of macroblocks per slice.
--slice-max-size sets a maximum slice size, in bytes (includes NAL overhead).
Implement macroblock re-encoding support to allow highly accurate slice size limitation. Might be useful for other things in the future, too.
- r1241
Fix a valgrind warning in b-adapt 2
- r1240
fix asm symbols for oprofile (regression in r1221)
- r1239
Fix bug in intra analysis in B-frames
i8x8/i4x4 never got analysed when fast_intra was toggled and RD was off; up to a 2-3% quality improvement in non-RD mode.
With this bug dating back to r369, this is probably the second-oldest bug ever fixed in x264.
- r1238
Fix bug in b16x16 qpel RD
Incorrect cost was used to initialize the search.
- r1237
Check minimum chroma QP in addition to luma QP during CQM init
Correctly error out if the implied minimum chroma QP is too low.
Add missing emms to checkasm macroblock_tree_propagate test.
- r1236
Faster mbtree propagate and x264_log2, less memory usage
Avoid an int->float conversion with a small table.
Change lowres_inter_types to a bitfield; cut its size by 75%.
Somewhat lower memory usage with lots of bframes.
Make log2/exp2 tables global to avoid duplication.
- r1235
Fix keyint=1 + VBV + rc-lookahead
- r1234
Faster x264_exp2fix8
22->13 cycles on Core 2 with mfpmath=sse
- r1233
compile x86 with fpmath=sse by default
- r1232
ARM configure: enable NEON-related options by default
When compiling for ARM, x264 will compile by default for Cortex A8 unless specified otherwise.
To compile for pre-ARMv6, --disable-asm is required.
- r1231
2-pass VBV fixes
Properly run slicetype frame cost with 2pass + MB-tree.
Slash the VBV rate tolerance in 2-pass mode; increasing it made sense for the highly reactive 1-pass VBV algorithm, but not for 2-pass.
2-pass's planned frame sizes are guaranteed to be reasonable, since they are based on a real first pass, while 1-pass's, based on lookahead SATD, cannot always be trusted.
- r1230
GSOC merge part 8: ARM NEON intra prediction assembly functions (partial)
4x4 dc/h/ddr/ddl, 8x8 dc/h, 8x8c h/v, 16x16 dc/h/v
- r1229
GSOC merge part 7: ARM NEON deblock assembly functions (partial)
Originally written for ffmpeg by Mans Rullgard; ported by David.
Luma and chroma inter deblocking; no intra yet.
- r1228
GSOC merge part 6: ARM NEON quant assembly functions (partial)
(de)quant 4x4, (de)quant 8x8, (de)quant DC, coeff_last
- r1227
GSOC merge part 5: ARM NEON dct assembly functions
(i)dct4x4dc, (i)dct4x4, (i)dct8x8, (i)dct_dc, zigzag_scan_frame_4x4
- r1226
GSOC merge part 4: ARM NEON mc assembly functions
prefetch, memcpy_aligned, memzero_aligned, avg, mc_luma, get_ref, mc_chroma, hpel_filter, frame_init_lowres
- r1225
GSOC merge part 3: ARM NEON pixel assembly functions
SAD, SADX3/X4, SSD, SATD, SA8D, Hadamard_AC, VAR, VAR2, SSIM
- r1224
GSOC merge part 2: ARM stack alignment
Neither GCC nor ARMCC support 16 byte stack alignment despite the fact that NEON loads require it.
These macros only work for arrays, but fortunately that covers almost all instances of stack alignment in x264.
- r1223
Fix unaligned accesses in bitstream writer
Fixes x264 on CPUs with no unaligned access support (e.g. SPARC).
Improves performance marginally on CPUs with penalties for unaligned stores (e.g. some x86).
- r1222
Fix bug in calculation of I-frame costs with AQ.
- r1221
GSOC merge part 1: Framework for ARM assembly optimizations
x264 will detect which ARM core it's building for and only build NEON asm if the target is ARMv6 or above, then enable NEON at runtime.
- r1220
Fix a bug in checkasm and two OSX fixes
MC chroma checkasm test could crash in some situations
Remove -lmx, as it's not needed and the iPhone doesn't have it.
Remove unused sqrtf emulation; it breaks if math.h is included.
- r1219
Improve QPRD
Always check the last macroblock's QP, even if the normal search doesn't reach it.
Raise the failure threshold when moving towards the last macroblock's QP.
0.2-1% improved compression.
- r1218
Fix MB-tree with keyint<3
Also slightly improve VBV keyint handling.
- r1217
Fix bug in VBV lookahead + no MB-tree
I-frames need to have VBV lookahead run on them as well.
- r1216
Add support for frame-accurate parameter changes
Parameter structs can now be passed with individual frames.
The previous method would only change the parameter of what was currently being encoded, which due to delay might be very far from an intended exact frame.
Also add support for changing aspect ratio. Only works in a stream with repeating headers and requires the caller to force an IDR to ensure instant effect.
- r1215
Fix x264_encoder_reconfig with multithreading
New behavior: reconfigging the encoder will result in changes being applied
to each of the encoding threads as they finish encoding the current frame.
- r1214
Fix two bugs in QPRD
QPRD could in some cases force blocks to skip when they shouldn't be ~(+0.01db)
Force QPRD to abide by qpmin/qpmax restrictions.
- r1213
Lookahead VBV
Use the large-scale lookahead capability introduced in MB-tree for ratecontrol purposes.
(Does not require MB-tree, however.)
Greatly improved quality and compliance in 1-pass VBV mode, especially in CBR; +2db OPSNR or more in some cases.
Fix some other bugs in VBV, which should improve non-lookahead mode as well.
Change the tolerance algorithm in row VBV to allow for more significant mispredictions when buffer is nearly full.
Note that due to the fixing of an extremely long-standing bug (>1 year), bitrates may change by nontrivial amounts in CRF without MB-tree.
- r1212
Fix bug in b-adapt 1
B-adapt 1 didn't use more than MAX(1,bframes-1) B-frames when MB-tree was off.
- r1211
Fix a potential failure in VBV
If VBV does underflow, ratecontrol could be permanently broken for the rest of the clip.
Revert part of the previous VBV changes to fix this.
- r1210
new API function x264_encoder_delayed_frames.
fix x264cli on streams whose total length is less than the encoder latency.
- r1209
Add no-mbtree to fprofile (and fix pyramid in fprofile)
- r1208
Don't print a warning about direct=auto in 2pass when B-frames are off
- r1207
fix lowres padding, which failed to extrapolate the right side for some resolutions.
fix a buffer overread in x264_mbtree_propagate_cost_sse2. no effect on actual behavior, only theoretical correctness.
fix x264_slicetype_frame_cost_recalculate on I-frames, which previously used all 0 mb costs.
shut up a valgrind warning in predict_8x8_filter_mmx.
- r1206
simd part of x264_macroblock_tree_propagate.
1.6x faster on conroe.
- r1205
MB-tree fixes:
AQ was applied inconsistently, with some AQed costs compared to other non-AQed costs. Strangely enough, fixing this increases SSIM on some sources but decreases it on others. More investigation needed.
Account for weighted bipred.
Reduce memory, increase precision, simplify, and early terminate.
- r1204
Add missing free()s for new data allocated for MB-tree
Eliminates a memory leak.
- r1203
Fix keyframe insertion with MB-tree and no B-frames
- r1202
Fix MP4 output (bug in malloc checking patch)
- r1201
Gracefully terminate in the case of a malloc failure
Fuzz tests show that all mallocs appear to be checked correctly now.
- r1200
Fix a potential infinite loop in QPfile parsing on Windows
ftell doesn't seem to work properly on Windows in text mode.
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