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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.

Yesterday's Activity

avcodec: add a raw DSD encoder
Kacper Michajłow: AV_SAMPLE_FMT_DSD frames are already the bitstream, so the dsd_msbf "encoder" is a plain copy of the samples into packets.

avcodec/wavpack: support raw DSD output
Kacper Michajłow: Output DSD frames as AV_SAMPLE_FMT_DSD.

avcodec/dstdec: support raw DSD output
Kacper Michajłow: Output the losslessly decompressed bitstream as AV_SAMPLE_FMT_DSD.

avcodec/dsddec: support raw DSD output
Kacper Michajłow: Output the raw bitstream as AV_SAMPLE_FMT_DSD when requested.

swresample: support AV_SAMPLE_FMT_DSD input
Kacper Michajłow: Convert DSD to PCM with the same 96-tap symmetric lowpass filter the libavcodec DSD decoders use.

Other Activity This Week

tests/checkasm/vf_colordetect: benchmark on aligned width
Niklas Haas: This gives a more faithful representation of the SIMD speedup, as the unaligned checkasm test case size is not representative of typical inputs.

avfilter/x86/vf_colordetect: avoid calling C code for tail handling
Niklas Haas: Instead, we can just call the SIMD function a second time.

avfilter/vf_colordetect: add threshold option
Niklas Haas: This is useful to filter false positives due to encoding noise in lossily compressed sources. The reason this is limited to 0.05 (= 5%) is twofold: 1.

avfilter/vf_colordetect: add support for full range alpha offset
Niklas Haas: This allows us to add a threshold for alpha comparisons to the full range path as well. The AArch64 changes were LLM-assisted, since I'm not familiar with that architecture.

hwcontext_vulkan: add support for selecting a device via text-form UUID
Lynne: We had everything we need for years but somehow never did it.

Changelog,doc: note H.264 data partitioning support
guy-with-a-why: The decoder now handles nal_unit_type 2 to 4.

avcodec/h264: decode slice data partitions B and C
guy-with-a-why: Syntax elements of category 2 stay in partition A, category 3 (intra residual) moves to partition B and category 4 (inter residual) to partition C, so CAVLC has to read the residual of each macroblock from the partition that matches its type.

avcodec/h264dec: add data partitioning fields to H264SliceContext
guy-with-a-why: A partitioned slice carries its residual in NAL units of its own, so the decoder needs a bit reader per partition next to the one for partition A.

avcodec/aacenc: add option to allow encoding non-PCE 7.1(wide)
Niklas Haas: PCE is not compatible with all downstream sources.

libswscale: use unaligned read/write macros in planarCopyWrapper
yongdev: When performing unscaled planar copies or format conversions on 16-bit buffers in planarCopyWrapper, srcPtr2 and dstPtr2 are not guaranteed to be 8-byte aligned (e.g.

avfilter/vf_scdet: add support for MSB-aligned pixel formats
Niklas Haas: This is trivial since the SAD result is already safe to 16 bits, and the result is already normalized by the bit depth.

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

vulkan: enable maintenance9 when supported
Lynne: Enables VK_KHR_maintenance9 when available.

hwcontext_vulkan: add support for selecting a device via text-form UUID
Lynne: We had everything we need for years but somehow never did it.

vulkan_video: allocate DPB images internally, outside of any frame machinery
Lynne: DISTINCT-mode references and encoder reconstruction images are never user-visible and only ever accessed by a single queue, yet were allocated through a full AVHWFramesContext: CONCURRENT-shared images (disabling compression on several drivers), plus an unused frames context with its own execution pools, per codec instance. Pool them internally as plain {image, memory, view, layout} entries: one video-stage memory barrier per submission orders all prior work, so they need no semaphores or dependencies, views are created once, and freeing a DISTINCT-mode picture no longer waits on the host.

vulkan: enable unified image layouts when supported
Lynne: Enables VK_KHR_unified_image_layouts when available, and queries its feature bits into FFVulkanContext.

Changelog,doc: note H.264 data partitioning support
guy-with-a-why: The decoder now handles nal_unit_type 2 to 4.

avformat: factor out iTunSMPB parsing
Romain Beauxis: Apple encoders store gapless playback information in this tag, in the metadata of mp4 files and, as an ID3v2 comment, of mp3 files, so move the parsing to a helper both demuxers can share.

avfilter/fruc_vulkan: add the initial optical-flow pipeline
Philip Langdale: Add the Vulkan optical-flow machinery on top of the filter skeleton: - a grayscale-extraction compute shader - the VK_NV_optical_flow session and its persistent input/flow images - the cross-queue (compute -> optical flow -> compute) submission with binary-semaphore ordering - an interpolation compute shader dispatched per output frame which blends each new frame instead of repeating the nearest source frame Notable characteristics: - At this stage we are doing a simple proportional blend that doesn't actually look at the optical flow information.

avcodec/aacenc: add support for writing PCE layouts with height channels
James Almer

avcodec/libfdk-aacdec: add support for top back and top side channels
James Almer: While PCE can signal these, libfdk-aac supports only up to 8 channels, so any sample that could contain these will most likely have more channels than can be decoded anyway.

avcodec/x86/hevc: add SSSE3 pred_planar
Marcos Ashton Iglesias: Implements planar intra prediction for 8 bit.

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