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FFmpeg

FFmpeg is a popular open-source multimedia framework commonly used for audio/video encode and decode functionality to a variety of codecs.

Other Activity This Week

swscale/aarch64/ops: remove overly-complicated generated lookup function
Ramiro Polla

avcodec/aacenc: rework NMR stereo decisions, retune coded bandwidth
Lynne: Stereo decisions are made per band before quantization, from the psy model's spectra, and carry cross-frame memory (EMA-smoothed statistics, per-grid mode banks, leave-hysteresis) so the image holds instead of churning: - M/S adopts content-driven and rate-free (side under half the mid); for mid-dominant bands M/S is simply the better coding at every rate, and a wandering L/R fraction reads as image instability. - I/S competes with M/S above 6.1 kHz instead of only seeing M/S rejects (which are exactly the wide bands it cannot render), and engages under SUSTAINED strain only: the pressure ramp gated by the lambda floor, so pressure spikes at a comfortable operating point cannot flood it onto content where coding the side is affordable and strictly better.

avcodec/aacpsy: sync block switching across channel pairs
Lynne: Implement the window_pair() hook: detect both channels of a CPE, then decide together - if either channel attacks, both switch, with one merged attack map so the grouping matches across the pair and common_window survives transients.

avcodec/aacenc_tns: enable short-block TNS via pooled per-group filters
Lynne: Per-window filters combined with group-shared scalefactors made short-block TNS produce decoder-synthesized silence: a weak residual in one sub-window rounds to zero under the group's scalefactor and the synthesis filter has nothing to re-amplify, audible as 1.5-3 ms dropouts on beat content.

avcodec/aacenc: rework NMR rate control, pool CPE budgets, add decision memory
Lynne: Rate control: replace the integral servo with a stateless pressure offset (exp2(-K*fill/R)) so a drained reservoir cannot wind up and crater quality after loud stretches; slew-limit the final operating lambda per frame (bits deviate instead, the reservoir absorbs); seed the reservoir full at stream start; and track rate strain explicitly: a long-frame lambda EMA against anchors that scale up when the achieved distortion/mask ratio flags noise-class content (whose psy masks are wholesale violated and lambda reads inflated), plus a lambda min-tracker separating sustained starvation from transient spikes at a comfortable operating point.

avcodec/psymodel: add pair-synced window switching hook and pair state
Lynne: Divergent block switching between the two channels of a CPE disables common_window, and with it every joint stereo tool, on exactly the frames that need them most; the lone short channel then codes its transient alone, which is audible as one-channel garble at beats.

swscale/x86/ops: add AVX512 vpermb packed shuffle path
Niklas Haas: We can quite easily generalize the existing AVX512 pushfb implementation to support vpermb when the shuffle mask is cross-lane. rgb24 1920x1080 -> rgba 1920x1080, speedup=1.372x faster This does require some finesse w.r.t.

avcodec/hevcdec: Support SMPTE-2094-50 metadata
Vignesh Venkat: Handle SMPTE-2094-50 metadata that appears as a SEI message.

avcodec/d3d12va_encode_av1: add user-configurable tile support
younengxiao: Add a "tiles" option (WxH format) to the D3D12VA AV1 encoder.

FFmpeg Release Tags

avutil/opt: Remove obsolete LIBAVUTIL_VERSION_MAJOR checks
Andreas Rheinhardt: Removing them has been forgotten during the lavu 59->60 bump.

qsvenc: restrict multi-frame encode to MFX_VERSION < 2.0
Haihao Xiang: Multi-frame encode isn't supported for MFX_VERSION >= 2.0[1][2].

qsvenc: restrict MFX_RATECONTROL_LA_EXT to MFX_VERSION < 2.0
Haihao Xiang: MFX_RATECONTROL_LA_EXT isn't supported for MFX_VERSION >= 2.0[1][2].

qsv: restrict OPAQUE memory to MFX_VERSION < 2.0
Haihao Xiang: OPAQUE memory isn't supported for MFX_VERSION >= 2.0[1][2].

avformat/libsrt: add missing SRT_VERSION_VALUE check
Marton Balint: This was missed in d7e2a2bb35e394287b3e3dc27744830bf0b7ca99.

avutil/attributes: add AV_GCC_VERSION_AT_MOST
James Almer

avutil/attributes: Add () to protect the AV_GCC_VERSION_AT_LEAST() arguments
Michael Niedermayer

avutil/version: Add () to protect the AV_VERSION_INT() arguments
Michael Niedermayer

Add FFMPEG_VERSION into the binary libs
Michael Niedermayer: This simplifies identifying from which revision a binary of a lib came from

Update back for git master
Michael Niedermayer

Most Popular In The Past Month

avcodec: add a graph based bitstream filtering API
James Almer: Tagged experimental for now, as it may see modifications depending on requirements.

lavc/apv_encode_vulkan: add a Vulkan APV encoder
Lynne: This commit adds a compliant Vulkan compute APV encoder.

avfilter: add latticepal filter
Michael Niedermayer: Convert packed 24/32-bit RGB/BGR/RGBA/BGRA input to PAL8 using a per-frame palette whose colors are placed on a face-centered cubic lattice (realized as the scaled D3/D4 checkerboard lattice), with a user-supplied density controlling the number of lattice steps spanning one color axis. Only lattice points actually used by a frame enter its palette; if a frame needs more than 256 of them, the filter will itearatively drop palettte entries and reassign affected pixels until 256 color remain lookup uses the Conway-Sloane rounding algorithm.

aaccoder: add NMR-based coder
Lynne

avcodec/bsf: add an LCEVC stream merging bsf
James Almer

avutil/crc: add aarch64 hybrid crc32 NEON PMULL+EOR SIMD implementation
Shreesh Adiga: Adding crc32 specialization for aarch64 which uses both PMULL and crc32 instructions to perform 192 bytes fold in one iteration, performing 9x PMULL and 6 crc32 in one loop iteration, obtaining higher performance for large inputs >8kB.

avcodec/cuviddec: add CUARRAY opaque output and zero-copy support
Diego de Souza: Implement opaque block-linear output for the CUVID decoder, mirroring the NVDEC hwaccel path but within the standalone CUVID demuxer/decoder.

swscale/rational64: add 64-bit rational type
Niklas Haas: This is needed by the ops code, to represent intermediate values for 32-bit formats, which can exceed the value range of int32_t (especially for intermediate products). I copied the math almost 1:1 from rational.c, but adapted to use the 128-bit integer wrappers defined by int128.h.

avcodec/nvdec: add opaque CUARRAY output and zero-copy decode support
Diego de Souza: Add support for NVDEC opaque output using block-linear CUarray surfaces registered with cuvidRegisterDecodeSurfaces (Video Codec SDK 13.1+). Two output modes are implemented: - Zero-copy (unsafe_output): decode surfaces are exposed directly to the consumer (e.g.

avcodec/d3d12va_encode_av1: add user-configurable tile support
younengxiao: Add a "tiles" option (WxH format) to the D3D12VA AV1 encoder.

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