Hi all, The attached patch adds a parameter that enables the user to choose which AVC/HEVC NAL units to include in the output. The parameter is supplied as a bitmask in order to keep things simple.
A short background on why we need it - in our transcoding process, we partition the video in chunks, the chunks are transcoded in parallel and packaged in MPEG-TS container. The transcoded TS chunks are then concatenated and packaged in MP4. These MP4 files are later repackaged on-the-fly to various protocols (HLS/DASH etc.) using our JIT packager. For performance reasons (can get into more detail if anyone's interested...), when packaging the MP4 to DASH/CENC, we configure the packager to assume that each AVC frame contains exactly one NAL unit. The problem is that the transition through MPEG-TS adds additional NAL units (NAL AUD before each frame + SPS/PPS before each key frame), and this assumption fails. Using the attached patch we can pass '-nal_types_mask 0x3e' which will make ffmpeg output only VCL NALs in the stream. Thanks! Eran
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