вс, 17 дек. 2023 г., 15:29 Terje J. Hanssen <terjejhanssen@gmail.com>:

Den 17.12.2023 00:05, skrev Andrew Randrianasulu:

пт, 15 дек. 2023 г., 21:10 Terje J. Hanssen via Cin <cin@lists.cinelerra-gg.org>:

Den 14.12.2023 12:25, skrev Terje J. Hanssen:

First, a summary from another current post and thread:
https://lists.cinelerra-gg.org/pipermail/cin/2023-December/007430.html

I will add the re-encoded sample SD DV file using ffmpeg SVT-AV1, as I was positive surprised how much faster (preset 10 about 25 sec) it was than rendering AV1 with CinGG (libaom?) . I've tested three presets: 8, 10 and 12. "Useable visible quality" for all.

    ffmpeg -i dv01_07.dv -c:v libsvtav1 -preset 8 -crf 35 -c:a libvorbis dv01_07_svt-av1_pr8.webm
    frame= 2832 fps= 66 q=35.0 Lsize=   28836kB time=00:01:53.26 bitrate=2085.6kbits/s speed=2.65x

    ffmpeg -i dv01_07.dv -c:v libsvtav1 -preset 10 -crf 35 -c:a libvorbis dv01_07_svt-av1_pr10.webm
    frame= 2832 fps=112 q=35.0 Lsize=   34419kB time=00:01:53.26 bitrate=2489.4kbits/s speed=4.47x

    ffmpeg -i dv01_07.dv -c:v libsvtav1 -preset 12 -crf 35 -c:a libvorbis dv01_07_svt-av1_pr12.webm
    frame= 2832 fps=262 q=35.0 Lsize=   35913kB time=00:01:53.26 bitrate=2597.5kbits/s speed=10.5x

The speed of SVT-AV1 encoding seems for me to be quite useable, at least for personal use.

As a reference to compare the SVT-AV1 results above, I've also tried to encode the same input file using libaom-av1 and librav1e
with simple or none (default) parameters. Other, optimal tuned parameters may possibly change the unsuccesful results here.
Seemingly something have to be wrong here, as I had to quit these hopeless SLOW encoding attemps after a while:

ffmpeg -i dv01_07.dv -c:v libaom-av1 -crf 30 -c:a libvorbis dv01_07_libaom-av1.webm
^C^Ze=   35 fps=0.1 q=0.0 size=       5kB time=00:00:03.00 bitrate= 13.7kbits/s speed=0.00748x

ffmpeg -i dv01_07.dv -c:v librav1e -c:a libvorbis dv01_07_librav1e.webm
frame= 471 fps=1.9 q=-0.0 Lsize=    4864kB time=00:00:19.11 bitrate=2084.4kbits/s speed=0.0791x

The CPU (i7 quad-cores 8 threads) utilization was here between 100-200%, while I think it ran at 700%+ for SVT-AV1.

Anyway, apparently SVT-AV1 libsvtav1 shines as the superiour fastest and simple to use CPU based AV1 encoder (before GPU hwaccels)

After rebuilding SVT-AV1 on termux for Neon acceleration I tried three variations of same file:

du -h av1-1.8.0*

5.0M av1-1.8.0-pr12.webm

4.3M av1-1.8.0-pr2.webm

4.6M av1-1.8.0.webm

all on crf 30

ffmpeg -i 20081103140154.m2t -c:v libsvtav1 -an -preset 2 -crf 30 av1-1.8.0-pr2.webm

this one run at 0.2 fps

ffmpeg -i 20081103140154.m2t -c:v libsvtav1 -an -preset 12 -crf 30 av1-1.8.0-pr12.webm

this one run up to 9.4 fps!

ffmpeg -i 20081103140154.m2t -c:v libsvtav1 -an -preset 6 -crf 30 av1-1.8.0.webm

and this one run at 1.3 fps.

all files encoded from same input:

Stream #0:0[0x810]: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002), yuv420p(tv, bt709, top first), 1440x1080 [SAR 4:3 DAR 16:9], 25000 kb/s, 25 fps, 25 tbr, 90k tbn

So, I guess on aarch64 tablet this one definitely not as fast as on desktop (x86_64) Intel.

I also noticed this post 1 (yr. ago) on reddit, "SVT-AV1 on ARM"
https://www.reddit.com/r/AV1/comments/z9fo51/svtav1_on_arm/

---------------------

So, regarding my initial "FHD (yuv422p10le)" below, where the audio was lost during transcode from .mov to AV1 .webm:
I have tried to interpret and experiment with FFMpeg's "Selecting streams with the -map option" https://trac.ffmpeg.org/wiki/Map

ffprobe tells pcm_s24leand 16 channels in the Audio stream of the PreRes input file hd01.mov:

Stream #0:0(eng): Video: prores (HQ) (apch / 0x68637061), yuv422p10le(tv, bt709/unknown/unknown, top coded first (swapped)), 1920x1080, 182130 kb/s, SAR 1:1 DAR 16:9, 25 fps, 25 tbr, 2500 tbn, 2500 tbc (default)
   Stream #0:1(eng): Audio: pcm_s24le (lpcm / 0x6D63706C), 48000 Hz, 16 channels, s32 (24 bit), 18432 kb/s (default)

VLC playback the audio ok for the input file. So I tried a similar stream map for transcode, but without success: Still no audio.

Is there possibility that you just hear 'empty'/silent channels? Are they all contain some audio, or some are silent?

Obviously I'm wrong applying this stream map numbering (just in case someone see the fault without using much energy on it)?

example from "man ffmpeg" says:

=====

For example, assuming INPUT is a stereo audio file, you can switch the two audio channels with the following command:

ffmpeg -i INPUT -map_channel 0.0.1 -map_channel 0.0.0 OUTPUT

If you want to mute the first channel and keep the second:

ffmpeg -i INPUT -map_channel -1 -map_channel 0.0.1 OUTPUT

The order of the "-map_channel" option specifies the order of the channels in

the output stream. The output channel layout is guessed from the number of

channels mapped (mono if one "-map_channel", stereo if two, etc.). Using "-ac" in combination of "-map_channel" makes the channel gain levels to be updated if input and output channel layouts don't match (for instance two

"-map_channel" options and "-ac 6").

=====

But may be you better to ask on ffmpeg-users mail list, not sure if anyone was dealing with input files with such high number of channels there recently, but it feels a bit more populated than our corner!

ffmpeg -i hd01.mov -map 0:v -map 0:a -c:v libsvtav1 -preset 10 -crf 35 -c:a libvorbis hd01_mov_svt-av1_pr10.webm

Ref:
https://ottverse.com/analysis-of-svt-av1-presets-and-crf-values/

Here I add my latest test results for a HDV (fps=69) and a FHD (fps=51) video clip.

2.0G    hdv01_04.m2t
383M    hdv01_04_m2t_svt-av1_pr10.webm

1.7G    hd01.mov
20M     hd01_mov_svt-av1_pr10.webm

HDV (yuv420p)
-------

ffprobe -hide_banner hdv01_04.m2t
[mpeg2video @ 0x560c32966340] Invalid frame dimensions 0x0.
    Last message repeated 7 times
[mpegts @ 0x560c32960c00] PES packet size mismatch
[mpegts @ 0x560c32960c00] Packet corrupt (stream = 1, dts = 295380000).
[mpegts @ 0x560c32960c00] Could not find codec parameters for stream 2 (Unknown: none ([160][0][0][0] / 0x00A0)): unknown codec
Consider increasing the value for the 'analyzeduration' (0) and 'probesize' (5000000) options
[mpegts @ 0x560c32960c00] Could not find codec parameters for stream 3 (Unknown: none ([161][0][0][0] / 0x00A1)): unknown codec
Consider increasing the value for the 'analyzeduration' (0) and 'probesize' (5000000) options
Input #0, mpegts, from 'hdv01_04.m2t':
Duration: 00:10:57.34, start: 2624.856000, bitrate: 26134 kb/s
Program 100
Stream #0:0[0x810]: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002), yuv420p(tv, bt709, top first), 1440x1080 [SAR 4:3 DAR 16:9], 25000 kb/s, 25 fps, 25 tbr, 90k tbn
    Side data:
      cpb: bitrate max/min/avg: 25000000/0/0 buffer size: 7340032 vbv_delay: N/A
Stream #0:1[0x814]: Audio: mp2 ([3][0][0][0] / 0x0003), 48000 Hz, stereo, fltp, 384 kb/s
Stream #0:2[0x815]: Unknown: none ([160][0][0][0] / 0x00A0)
Stream #0:3[0x811]: Unknown: none ([161][0][0][0] / 0x00A1)
Unsupported codec with id 0 for input stream 2
Unsupported codec with id 0 for input stream 3
--------------

ffmpeg -i hdv01_04.m2t -c:v libsvtav1 -preset 10 -crf 35 -c:a libvorbis hdv01_04_m2t_svt-av1_pr10.webm
frame=16420 fps= 69 q=34.0 Lsize= 391289kB time=00:10:57.36 bitrate=4876.2kbits/s speed=2.77x

ffprobe -hide_banner hdv01_04_m2t_svt-av1_pr10.webm
[libdav1d @ 0x562b42305540] libdav1d 1.3.0
Input #0, matroska,webm, from 'hdv01_04_m2t_svt-av1_pr10.webm':
Metadata:
    ENCODER         : Lavf60.3.100
Duration: 00:10:57.40, start: 0.000000, bitrate: 4875 kb/s
Stream #0:0: Video: av1 (Main), yuv420p(tv, bt709), 1440x1080, SAR 4:3 DAR 16:9, 25 fps, 25 tbr, 1k tbn
    Metadata:
      ENCODER         : Lavc60.3.100 libsvtav1
      DURATION        : 00:10:57.403000000
Stream #0:1: Audio: vorbis, 48000 Hz, stereo, fltp
    Metadata:
      ENCODER         : Lavc60.3.100 libvorbis
      DURATION        : 00:10:57.171000000
[libdav1d @ 0x562b42361540] libdav1d 1.3.0

FHD (yuv422p10le)
-----

ffprobe hd01.mov
.....
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'hd01.mov':
Metadata:
    creation_time   : 2016-02-23T23:49:21.000000Z
Duration: 00:01:11.28, start: 0.000000, bitrate: 200496 kb/s
Stream #0:0[0x1](eng): Video: prores (HQ) (apch / 0x68637061), yuv422p10le(bt709, top coded first (swapped)), 1920x1080, 182130 kb/s, SAR 1:1 DAR 16:9, 25 fps, 25 tbr, 2500 tbn (default)
    Metadata:
      creation_time   : 2016-02-23T23:49:21.000000Z
      handler_name    : Apple Video Media Handler
      vendor_id       : appl
      encoder         : Apple ProRes 422 (HQ)
Stream #0:1[0x2](eng): Audio: pcm_s24le (lpcm / 0x6D63706C), 48000 Hz, 16 channels, s32 (24 bit), 18432 kb/s (default)
    Metadata:
      creation_time   : 2016-02-23T23:49:21.000000Z
      handler_name    : Apple Sound Media Handler
      vendor_id       : [0][0][0][0]

ffmpeg -i hd01.mov -c:v libsvtav1 -preset 10 -crf 35 -c:a libvorbis hd01_mov_svt-av1_pr10.webm
frame= 1781 fps= 51 q=35.0 Lsize=   19732kB time=00:01:11.26 bitrate=2268.3kbits/s speed=2.03x

ffprobe -hide_banner hdv01_04_m2t_svt-av1_pr10.webm
[libdav1d @ 0x562b42305540] libdav1d 1.3.0
Input #0, matroska,webm, from 'hdv01_04_m2t_svt-av1_pr10.webm':
Metadata:
    ENCODER         : Lavf60.3.100
Duration: 00:10:57.40, start: 0.000000, bitrate: 4875 kb/s
Stream #0:0: Video: av1 (Main), yuv420p(tv, bt709), 1440x1080, SAR 4:3 DAR 16:9, 25 fps, 25 tbr, 1k tbn
    Metadata:
      ENCODER         : Lavc60.3.100 libsvtav1
      DURATION        : 00:10:57.403000000
Stream #0:1: Audio: vorbis, 48000 Hz, stereo, fltp
    Metadata:
      ENCODER         : Lavc60.3.100 libvorbis
      DURATION        : 00:10:57.171000000

An issue is that the audio was lost during the conversion from .mov to .webm, so I attach the full ffmpeg output below.
(possibly a mis-match regarding the audio stream #numbers ?)

ffmpeg -i hd01.mov -c:v libsvtav1 -preset 10 -crf 35 -c:a libvorbis hd01_mov_svt-av1_pr10.webm
...
Guessed Channel Layout for Input Stream #0.1 : hexadecagonal
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'hd01.mov':
Metadata:
    creation_time   : 2016-02-23T23:49:21.000000Z
Duration: 00:01:11.28, start: 0.000000, bitrate: 200496 kb/s
Stream #0:0[0x1](eng): Video: prores (HQ) (apch / 0x68637061), yuv422p10le(bt709, top coded first (swapped)), 1920x1080, 182130 kb/s, SAR 1:1 DAR 16:9, 25 fps, 25 tbr, 2500 tbn (default)
    Metadata:
      creation_time   : 2016-02-23T23:49:21.000000Z
      handler_name    : Apple Video Media Handler
      vendor_id       : appl
      encoder         : Apple ProRes 422 (HQ)
Stream #0:1[0x2](eng): Audio: pcm_s24le (lpcm / 0x6D63706C), 48000 Hz, 16 channels, s32 (24 bit), 18432 kb/s (default)
    Metadata:
      creation_time   : 2016-02-23T23:49:21.000000Z
      handler_name    : Apple Sound Media Handler
      vendor_id       : [0][0][0][0]
Stream mapping:
Stream #0:0 -> #0:0 (prores (native) -> av1 (libsvtav1))
Stream #0:1 -> #0:1 (pcm_s24le (native) -> vorbis (libvorbis))
Press [q] to stop, [?] for help
Svt[info]: -------------------------------------------
Svt[info]: SVT [version]:    SVT-AV1 Encoder Lib v1.7.0
Svt[info]: SVT [build] :    GCC 13.2.1 20230912 [revision b96e66fd4ef3e36983969fb8cdd1956f551a074b]    64 bit
Svt[info]: LIB Build date: Nov 3 2023 00:00:00
Svt[info]: -------------------------------------------
Svt[info]: Number of logical cores available: 8
Svt[info]: Number of PPCS 59
Svt[info]: [asm level on system : up to avx2]
Svt[info]: [asm level selected : up to avx2]
Svt[info]: -------------------------------------------
Svt[info]: SVT [config]: main profile    tier (auto)    level (auto)
Svt[info]: SVT [config]: width / height / fps numerator / fps denominator         : 1920 / 1080 / 25 / 1
Svt[info]: SVT [config]: bit-depth / color format                     : 10 / YUV420
Svt[info]: SVT [config]: preset / tune / pred struct                     : 10 / PSNR / random access
Svt[info]: SVT [config]: gop size / mini-gop size / key-frame type             : 161 / 16 / key frame
Svt[info]: SVT [config]: BRC mode / rate factor                     : CRF / 35
Svt[info]: -------------------------------------------
Output #0, webm, to 'hd01_mov_svt-av1_pr10.webm':
Metadata:
    encoder         : Lavf60.3.100
Stream #0:0(eng): Video: av1, yuv420p10le(tv, bt709, top coded first (swapped)), 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 25 fps, 1k tbn (default)
    Metadata:
      creation_time   : 2016-02-23T23:49:21.000000Z
      handler_name    : Apple Video Media Handler
      vendor_id       : appl
      encoder         : Lavc60.3.100 libsvtav1
Stream #0:1(eng): Audio: vorbis, 48000 Hz, hexadecagonal, fltp (default)
    Metadata:
      creation_time   : 2016-02-23T23:49:21.000000Z
      handler_name    : Apple Sound Media Handler
      vendor_id       : [0][0][0][0]
      encoder         : Lavc60.3.100 libvorbis
frame= 1781 fps= 51 q=35.0 Lsize=   19732kB time=00:01:11.26 bitrate=2268.3kbits/s speed=2.03x
video:18635kB audio:1059kB subtitle:0kB other streams:0kB global headers:3kB muxing overhead: 0.193378%

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