On 09/03/2026 11:28, Andrew Randrianasulu wrote:
You need to set remappig manually in (for single-user buld)
bin/ffmpeg/decode.opts
like
remap_video_decoder mpeg2video=mpeg2_qsv
and other similar lines if you want to test other formats (hevc, h264)
Thank you for quick response. After editing: ~/Applications/squashfs-root/usr/bin/ffmpeg # cat decode.opts # apply at init decode loglevel=fatal formatprobesize=5000000 scan_all_pmts=1 remap_video_decoder libaom-av1=libdav1d remap_video_decoder mpeg2video=mpeg2_qsv Compilation of my test results as follows: mpeg2 transcoded to h264_qsv.mp4 * decoding in cpu/gpu * Cingg: 265/300 fps * ffmpeg: 548/562 fps mpeg2 transcoded to hevc_qsv.mp4 * decoding in cpu/gpu * Cingg: 290/294 fps * ffmpeg: - /688 fps mpeg2 transcoded to av1_qsv.mp4 * decoding in cpu/gpu * Cingg: 251/325 fps * ffmpeg: 631/698 fps As seen the Cingg fps results are much slower than my system ffmpeg results. Is there any way to verify that decoding is done in the gpu like with ffmpeg?
On Sun, Mar 8, 2026 at 11:46 PM Terje J. Hanssen via Cin <[email protected]> wrote:
I have tested transcoding mpeg2video to h264_qsv, hevc_qsv, vp9_qsv and av1_qsv HW GPU accelerated decoding+encoding with ffmpeg. Just by adding "-hwaccel qsv" before the input file, the correct qsv codec for decoding in GPU apparently is auto-detected.
ffmpeg -hide_banner -hwaccel qsv -i hdv09_04.m2t -c:v hevc_qsv -y hdv09_04_ffmpeg_hevc_qsv.mp4
With a medium powerful (balanced) Intel Alder Lake (i7-12700KF) /DG2 (A750) the qsv.mp4 video output and playback are clean and faster with GPU decoding. For the legacy, limited SkyLake (h264_qsv) and Coffee Lake (hevc_qsv) igpu's, it is best to keep decoding in CPU, due to igpu buffer errors and some distortions on the playback.
So I wonder if it manageable to test-implement an additional environment variable "CIN_HW_DEV=qsv" for GPU HW decoding that adds "-hwaccel qsv" on the input side? If it works, it may be added as a "Use HW Device: qsv" next.
Terje J. H
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