пн, 5 мая 2025 г., 17:00 Andrew Randrianasulu <[email protected]>:
> > > 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? > https://git.ffmpeg.org/gitweb/ffmpeg.git/blob/HEAD:/libavdevice/v4l2-common.c I can't see 10bit yuy2 format listed here, so probably even if hw/driver support it ffmpeg will not ... > 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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