пт, 12 янв. 2024 г., 01:44 Terje J. Hanssen via Cin < [email protected]>:
I wanted to test AV1.webm rendering from anamorphic 16:9 SD-DV(D) widescreen sources, which have different SAR 64:45 than 1080i HDV SAR 4:3
It would be fine to get this SAR value verified and clarified vs Wikipedia's table which specifies different for PAL (16:9) 720x576 : SAR 5:4, PAR 64:45
https://en.wikipedia.org/wiki/Pixel_aspect_ratio#Pixel_aspect_ratios_of_comm...
This legacy 16:9 SD format was created and can be obtained among the following methods::
1. DV camcorders with Widescreen feature, the right/true way and wrong/fake way
https://www.videouniversity.com/articles/dv-formats-everything-you-need-to-k... 2. DV wide record or downconvert playback using a HD(V) camcorder with this feature 3. DVD video disc enhanced for 16:9 or a BD video disc with 16:9 SD content 4. Render/transcode i.e a HD(V) video file using a) Cin-GG b) FFmpeg
I have used the two latter methods as follows:
4 a) Cin-GG Loaded a PAL 1080i/50 HDV clip Set Format Preset: PAL 576i (16:9) - DV(D) File Render File Format: FFmepg - avi (NB! because plain Raw DV still causes DAR 4:3) Audio: Preset: avi_pcm_s16.avi Video: Compression: dv_pal.avi
ffprobe -hide_banner dv07_05_wide_cingg.avi Input #0, avi, from 'dv07_05_wide_cingg.avi': Metadata: software : Lavf60.16.100 Duration: 00:06:58.04, start: 0.000000, bitrate: 30342 kb/s Stream #0:0: Video: dvvideo (dvsd / 0x64737664), yuv420p, 720x576 [SAR 64:45 DAR 16:9], 28802 kb/s, 25 fps, 25 tbr, 25 tbn, 25 tbc Stream #0:1: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 48000 Hz, 2 channels, s16, 1536 kb/s
mediainfo dv07_05_wide_cingg.avi General Complete name : dv07_05_wide_cingg.avi Format : AVI Format/Info : Audio Video Interleave Commercial name : DV Format profile : OpenDML Format settings : BitmapInfoHeader / PcmWaveformat File size : 1.48 GiB Duration : 6 min 58 s Overall bit rate mode : Constant Overall bit rate : 30.3 Mb/s Frame rate : 25.000 FPS Writing application : Lavf60.16.100
Video ID : 0 Format : DV Codec ID : dvsd Codec ID/Hint : Sony Duration : 6 min 58 s Bit rate mode : Constant Bit rate : 24.4 Mb/s Width : 720 pixels Height : 576 pixels Display aspect ratio : 16:9 Frame rate mode : Constant Frame rate : 25.000 FPS Standard : PAL Color space : YUV Chroma subsampling : 4:2:0 Bit depth : 8 bits Scan type : Interlaced Scan order : Bottom Field First Compression mode : Lossy Bits/(Pixel*Frame) : 2.357 Stream size : 1.40 GiB (95%)
Audio ID : 1 Format : PCM Format settings : Little / Signed Codec ID : 1 Duration : 6 min 58 s 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 : 76.6 MiB (5%) Alignment : Aligned on interleaves Interleave, duration : 208 ms (5.21 video frames)
4 b) FFmpeg transcode HDV to DV-wide
ffmpeg -hide_banner -i hdv07_05.m2t -vf scale=720:576,setsar=64/45,setdar=16/9 -c:v dvvideo -c:a pcm_s16le dv07_05_wide.dv Stream mapping: Stream #0:0 -> #0:0 (mpeg2video (native) -> dvvideo (native)) Stream #0:1 -> #0:1 (mp2 (native) -> pcm_s16le (native)) Stream #0:0: Video: dvvideo, yuv420p(tv, bt709, top coded first (swapped)), 720x576 [SAR 64:45 DAR 16:9], q=2-31, 200 kb/s, 25 fps, 25 tbn Stream #0:1: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s frame=10457 fps=356 q=-0.0 Lsize= 1440422kB time=00:06:58.28 bitrate=28210.6kbits/s dup=217 drop=0 speed=14.3x
ffprobe -hide_banner dv07_05_wide.dv [dv @ 0x56036476e580] Estimating duration from bitrate, this may be inaccurate Input #0, dv, from 'dv07_05_wide.dv': Metadata: timecode : 00:00:00:00 Duration: 00:06:49.72, start: 0.000000, bitrate: 28800 kb/s Stream #0:0: Video: dvvideo, yuv420p, 720x576 [SAR 64:45 DAR 16:9], 25000 kb/s, 25 fps, 25 tbr, 25 tbn, 25 tbc Stream #0:1: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
mediainfo dv07_05_wide.dv General Complete name : dv07_05_wide.dv Format : DV Commercial name : DVCAM File size : 1.37 GiB Duration : 6 min 49 s Overall bit rate mode : Constant Overall bit rate : 28.8 Mb/s Frame rate : 25.000 FPS Recorded date : 1970-01-01 00:00:00.000
Video Format : DV Commercial name : DVCAM Duration : 6 min 49 s Bit rate mode : Constant Bit rate : 24.4 Mb/s Width : 720 pixels Height : 576 pixels Display aspect ratio : 16:9 Frame rate mode : Constant Frame rate : 25.000 FPS Standard : PAL Color space : YUV Chroma subsampling : 4:2:0 Bit depth : 8 bits Scan type : Interlaced Scan order : Top Field First Compression mode : Lossy Bits/(Pixel*Frame) : 2.357 Time code of first frame : 00:00:00:00 Time code source : Subcode time code Stream size : 1.17 GiB (85%)
Audio ID : 0 Format : PCM Format settings : Big / Signed Duration : 6 min 49 s 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 : 75.0 MiB (5%)
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The HDV source has Scan order : Top Field First What would be right, Top or Bottom Field First for the output file (they differ)?
If I read this random Avid-related post correctly - bottom? https://community.avid.com/forums/p/55996/312955.aspx from memory if you step around wrongly fielded file you get some jarring line motions different from usual interlace-on-progressive line artefacts ....
Rendering next the AVI and DV files to AV1.webm displays correct 16:9 widescreen
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