пн, 5 мая 2025 г., 16:26 Terje J. Hanssen via Cin < [email protected]>:
> I consider to make a second preservation backup for archiving my Analog > S-video and HDV footages on tapes to lossless compressed FFV1.MKV files > stored on large USB3 expansion disks. Also ffv1 HW (vulkan) decoding (next > and encoding (later?) are of interest in this context. > > Related previous threads > https://www.mail-archive.com/[email protected]/msg05547.html > https://www.mail-archive.com/[email protected]/msg03791.html > https://www.mail-archive.com/[email protected]/msg05547.html > > I adapt simply the last ffmpeg mpeg-2 code line to a first ffv1, version 3 > test, 10 sec file > > ffmpeg -hide_banner -f v4l2 -input_format yuyv422 -video_size 720x576 > -framerate 50 -i /dev/video0 -f alsa -ac 2 -i hw:CARD=UHD,DEV=0 -c:v ffv1 > -level 3 -c:a pcm_s16le -t 10 720x576_50fps+alsa_ms2130_ffv1-3+pcm.mkv > > Input #0, video4linux2,v4l2, from '/dev/video0': > Duration: N/A, start: 351.803278, bitrate: 331776 kb/s > Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 720x576, > 331776 kb/s, 50 fps, 50 tbr, 1000k tbn > [aist#1:0/pcm_s16le @ 0x555a99736cc0] Guessed Channel Layout: stereo > Input #1, alsa, from 'hw:CARD=UHD,DEV=0': > Duration: N/A, start: 1746445045.742179, bitrate: 1536 kb/s > Stream #1:0: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s > Stream mapping: > Stream #0:0 -> #0:0 (rawvideo (native) -> ffv1 (native)) > Stream #1:0 -> #0:1 (pcm_s16le (native) -> pcm_s16le (native)) > Press [q] to stop, [?] for help > Output #0, matroska, to '720x576_50fps+alsa_ms2130_ffv1-3+pcm.mkv': > Metadata: > encoder : Lavf61.7.100 > Stream #0:0: Video: ffv1 (FFV1 / 0x31564646), yuv422p(tv, progressive), > 720x576, q=2-31, 200 kb/s, 50 fps, 1k tbn > Metadata: > encoder : Lavc61.19.101 ffv1 > Stream #0:1: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 48000 Hz, stereo, > s16, 1536 kb/s > Metadata: > encoder : Lavc61.19.101 pcm_s16le > [out#0/matroska @ 0x555a99736f40] video:57467KiB audio:1875KiB > subtitle:0KiB other streams:0KiB global headers:0KiB muxing overhead: > 0.069226% > frame= 500 fps= 50 q=-0.0 Lsize= 59383KiB time=00:00:10.00 > bitrate=48646.9kbits/s speed=0.998x > > > ---------- > > du -sh * > 58M 720x576_50fps+alsa_ms2130_ffv1-3+pcm.mkv > > ---------- > > ffprobe -hide_banner 720x576_50fps+alsa_ms2130_ffv1-3+pcm.mkv > > Input #0, matroska,webm, from '720x576_50fps+alsa_ms2130_ffv1-3+pcm.mkv': > Metadata: > ENCODER : Lavf61.7.100 > Duration: 00:00:10.00, start: 0.000000, bitrate: 48646 kb/s > Stream #0:0: Video: ffv1 (FFV1 / 0x31564646), yuv422p(tv, progressive), > 720x576, 50 fps, 50 tbr, 1k tbn > Metadata: > ENCODER : Lavc61.19.101 ffv1 > DURATION : 00:00:10.000000000 > Stream #0:1: Audio: pcm_s16le, 48000 Hz, 2 channels, s16, 1536 kb/s > Metadata: > ENCODER : Lavc61.19.101 pcm_s16le > DURATION : 00:00:10.000000000 > > > ------------ > > mediainfo 720x576_50fps+alsa_ms2130_ffv1-3+pcm.mkv > > General > Unique ID : > 158479793538002634101121179263279280827 (0x773A19163BEA6038DF448CE1529BB2BB) > Complete name : > 720x576_50fps+alsa_ms2130_ffv1-3+pcm.mkv > Format : Matroska > Format version : Version 4 > File size : 58.0 MiB > Duration : 10 s 0 ms > Overall bit rate mode : Variable > Overall bit rate : 48.6 Mb/s > Frame rate : 50.000 FPS > Writing application : Lavf61.7.100 > Writing library : Lavf61.7.100 > ErrorDetectionType : Per level 1 > > Video > ID : 1 > Format : FFV1 > Format version : Version 3.4 > Format settings, Slice count : 4 slices per frame > Codec ID : V_MS/VFW/FOURCC / FFV1 > Duration : 10 s 0 ms > Bit rate mode : Variable > Bit rate : 46.1 Mb/s > Width : 720 pixels > Height : 576 pixels > Display aspect ratio : 5:4 > Frame rate mode : Constant > Frame rate : 50.000 FPS > Color space : YUV > Chroma subsampling : 4:2:2 > Bit depth : 8 bits > Scan type : Progressive > Compression mode : Lossless > Bits/(Pixel*Frame) : 2.225 > Stream size : 55.0 MiB (95%) > Writing library : Lavc61.19.101 ffv1 > Default : No > Forced : No > Color range : Limited > coder_type : Golomb Rice > ErrorDetectionType : Per slice > > Audio > ID : 2 > Format : PCM > Format settings : Little / Signed > Codec ID : A_PCM/INT/LIT > Duration : 10 s 0 ms > Bit rate mode : Constant > Bit rate : 1 536 kb/s > Channel(s) : 2 channels > Sampling rate : 48.0 kHz > Bit depth : 16 bits > Stream size : 1.83 MiB (3%) > Writing library : Lavc61.19.101 pcm_s16le > Default : No > Forced : No > > --------------------------------- > > As seen above the "default" Chroma subsampling is yuv422p or 4:2:2 with > Bit depth: 8 bits > > As ffv1 seemingly also does support yuv422p10le ffmpeg, I wonder if > yuv422p is limited by the input from HDMI capture/AV converter? > Can possibly yuv422p10le possibly be achieved by adding -pix_fmt 10 og > similar syntax to the ffmpeg line? > you can try different -input_format, but I suspect 10bit video over v4l2 at best uncommon ... While hdmi itself supports 10bit digital signal, I suspect non-pro capture devices usually limited to 8bit? But of course you better to doublecheck what v4l2 tools says ... Sorry for "too generic" answer, few years ago I/we looked into "direct RF capture" and there getting 10bit signal was possible, with custom hardware, slow offline processing and invasive hoockup to VCR's internals. > > > > > > > > > -- > Cin mailing list > [email protected] > https://lists.cinelerra-gg.org/mailman/listinfo/cin >
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