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Stanislav Dolganov designed and implemented experimental support for motion estimation and compensation in the lossless FFV1 codec. The design and implementation is based on the snow video codec, which uses OBMC. Stanislav's work proved that significant compression gains can be achieved with inter frame compression. FFmpeg welcomes Stanislav to continue working beyond this proof of concept and bring its advances into the official FFV1 specification within the IETF.
Jai Luthra's objective was to update the out-of-tree and pretty much abandoned MLP (Meridian Lossless Packing) encoder for libavcodec and improve it to enable encoding to the TrueHD format. For the qualification period the encoder was updated such that it was usable and throughout the summer, successfully improved adding support for multi-channel audio and TrueHD encoding. Jai's code has been merged into the main repository now. While a few problems remain with respect to LFE channel and 32 bit sample handling, these are in the process of being fixed such that effort can be finally put in improving the encoder's speed and efficiency.
Video codec/profile, encoding syntax, MBAFF, video bitrate VBR/CBR, frame size, frame rate, video buffer size, frame aspect ratio, pixel aspect ratio, GOP length, GOP structure, field order flagged/baseband, cadence, drop frame, chroma format, luminance, black level, chroma level, HDR MaxFALL/MaxCLL.
Each track: audio codec, bit depth, sample rate, audio bitrate, number of channels, channel layout, channel mapping, tones, phase coherence between channels, track present during video, min levels, peak levels, clipping, clicks and pops, PPM, DialNorm, integrated/short term/momentary loudness (ITU/EBU/ATSC/ CALM/BS-1770), BLITS, GLITS & EBU test tone checks, digital silence. Supports 32-channel audio
Standard codecs include PCM Audio (WAV/AES/BWF), AAC, HE-AAC, WMA Standard Pro, MPEG-2 (L1,2,3) and MPEG-1. Audio correction is available on constant bit rate codecs only. Optional codecs are available to support Dolby Digital (AC-3), Dolby Digital Plus (EAC-3), Dolby TrueHD (MLP), and Dolby E.
Aurora metadata tests include Container Syntax, Video Essence Syntax, Caption Syntax, Container Essence Contents, Cross-Check Container- Essence, Rude Word Detection in Text, Start Time code, Time code Discontinuity, Video Resolution and Run-times. Additional metadata tests for Dolby Audio Syntax and Dolby E Guard Band Alignment are included with the optional Dolby codecs.
Aurora can test and play back the Interoperable Master Format (IMF), the distribution master format agreed on by major motion picture studios, and the supplemental IMF packages. Aurora has the ability to QC and play back complex Composition Play Lists (CPLs) and can test 4K at real-time or faster in any other container or codec, including JPEG 2000, DPX, DNxHR, HEVC, H.264/AVC/AVCI/XAVC. 1
These cameras and camcorders may encode a video with different codecs. MXF as a container format can store videos encoded with these codecs: MPEG2, MPEG4, H264, DV, DVCPro 50, DVCPro HD, ProRes, DNxHD, DNxHR, XDCAM formats (such as DVCAM, MPEG IMX, MPEG HD422, Proxy AV).
1. About frame rate: Depending on the recording device and settings, MXF videos can be recorded with different frame rate, such as 59.94i, 23.98p, 29.97p, 25p, 59.94p, 59.94i, 50i, etc. Using VideoProc Converter, in codec settings (gear icon), you have options to keep the original frame rate, or convert it to popular FPS for YouTube and other platforms.
The steps are the same as using other online conversion tools, except that this tool doesn't have codec settings. Based on our test, it uses MPEG-4 as the video codec for MP4 output. Another thing to notice is, the uploaded files must be of the same extension for every batch task. For instance, you cannot upload MXF and MOV at the same time for MP4 conversion in a batch.
iMovie doesn't support MXF files well. Some Sony users complain that iMovie won't import the MXF file from the camcorder, or the audio is missing. To edit an MXF file in iMovie efficiently, you can use VideoProc Converter to convert MXF to MP4, or better still, remux the MXF to ProRes, which is an editing-friendly codec.
Windows Media Player has limited support of video codecs and containers. When playing MXF videos in WMP, you may see a black screen, or video jitters. To open MXF file in Windows Media Player, you can follow the tutorial above to convert it to MP4.
In addition to these separate git repositories there was a gst-build module that would use the Meson build system's subproject feature to download each individual module and then build everything in one go. It would also provide an uninstalled development environment that made it easy to work on GStreamer and use or test versions other than the system-installed GStreamer version.
VP8/VP9 don't support alpha components natively in the codec, so the way this is implemented in WebM is by encoding the alpha plane with transparency data as a separate VP8/VP9 stream. Inside the WebM container (a variant of Matroska) this is coded as a single video track with the "normal" VP8/VP9 video data making up the main video data and each frame of video having an encoded alpha frame attached to it as extra data ("BlockAdditional").
matroskademux has been extended extract this per-frame alpha side data and attach it in form of a GstVideoCodecAlphaMeta to the regular video buffers. Note that this new meta is specific to this VP8/VP9 alpha support and can't be used to just add alpha support to other codecs that don't support it. Lastly, matroskademux also advertises the fact that the streams contain alpha in the caps.
gst_codec_utils_h264_get_profile_flags_level(): Parses profile, flags, and level from H.264 AvcC codec_data. The format of H.264 AVCC extradata/sequence_header is documented in the ITU-T H.264 specification section 18.104.22.168.1 as well as in ISO/IEC 14496-15 section 22.214.171.124.2.
gst_codec_utils_caps_get_mime_codec() to convert caps to a RFC 6381 compatible MIME codec string codec. Useful for providing the codecs field inside the Content-Type HTTP header for container formats, such as mp4 or Matroska.
Always advertise support for the transport-cc RTCP feedback protocol as rtpbin supports it. For full support, the configured caps (input or through codec-preferences) need to include the relevant RTP header extension.
The GstVideoDecoder base class gained API to process input at the sub-frame level. That way video decoders can start decoding slices before they have received the full input frame in its entirety (to the extent this is supported by the codec, of course). This helps with CPU utilisation and reduces latency.