[Cin] Anamorphic 16:9 SD-DV(D) widescreen to AV1.webm
Terje J. Hanssen
terjejhanssen at gmail.com
Fri Jan 12 02:21:12 CET 2024
Den 11.01.2024 23:43, skrev Terje J. Hanssen:
> 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_common_video_formats
Also, /pixel aspect ratio/ (/PAR/) is also known as /sample aspect
ratio/ (abbreviated /SAR/) in some industrial standards (such as H.264
<https://en.wikipedia.org/wiki/Advanced_Video_Coding>^[2]
<https://en.wikipedia.org/wiki/Pixel_aspect_ratio#cite_note-2> ) and
output of programs (such as /ffmpeg <https://en.wikipedia.org/wiki/Ffmpeg>/
Note 3: "ffprobe shows PAR as SAR"
<https://trac.ffmpeg.org/ticket/1776>. ffmpeg.org. Retrieved 2022-06-10.
>
>
> 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-know/#widescreen
> 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%)
>
> ---------------------------------
>
> The HDV source has Scan order : Top Field First
> What would be right, Top or Bottom Field First for the output file
> (they differ)?
>
> Rendering next the AVI and DV files to AV1.webm displays correct 16:9
> widescreen
>
>
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