The following constraints apply:
- The maximum resolution must be known.
- All the streams should belong to same codec either AVC or HEVC.
- Same chroma-format and bit-depth.
- Maximum resolution can be set either with the pre-allocation mode or with the first valid SPS. In case the SPS defines a resolution higher than the one provided in pre-allocation, the decoder skips the frames until the next valid SPS.
- While going from low to high without pre-allocation, resolutions lower than or equal to the first valid resolution that are met are decoded. Pictures and references should always fit in the DPB.
Use --prealloc-args
widthxheight:video-mode:chroma-mode:bitdepth:profile-idc:level to specify maximum width
and height and other parameters.
ctrlsw_decoder -avc -i in.avc --prealloc-args 3840x2160:progr:420:8:66:51 -o out.yuvFor GStreamer the first sequence in the stream must have the maximum width and height.
gst-launch-1.0 filesrc location=in.avc ! h264parse ! omxh264dec low-latency=0 internal-entropy-buffers=5 ! queue max-size-bytes=0 ! filesink location=out.yuvUsing ctrlsw-encoder to switch between 1920x1080@30p and
720x480@60, specify in the .cfg file:
[INPUT]
YUVFile = input_1.yuv
Format = NV12
Width = 1920
Height = 1080
CmdFile = input_cmd.txt
[DYNAMIC_INPUT]
YUVFile = input_2.yuv
Width = 720
Height = 480
and in file input_cmd.txt:
50: Fps=30, Input=1
90: Fps=60, Input=2
For GStreamer the first sequence should have the maximum resolution in the stream.
Transcode a dynamic resolution stream.
gst-launch-1.0 filesrc location=in.avc ! h264parse ! omxh264dec low-latency=0 internal-entropy-buffers=9 ! queue max-size-bytes=0 ! omxh265enc target-bitrate=50000 ! video/x-h265, profile=main, alignment=au ! filesink location=out.hevc