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Rennes Emotion Map 2010-11
19 octobre 2011, par
Mis à jour : Juillet 2013
Langue : français
Type : Texte
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The SSIM values calculated using FFMPEG are not what I expected
18 mai 2020, par fd-alexerI'm trying to encode an m2ts (MPEG-2 Transport Stream) file to mp4 (H.264) and get the ssim value.

I did get some SSIM values, but the results were contrary to my expectations.


Are there wrong command options for ffmpeg ?



Encoding and SSIM calculation commands



# encode
$ ffmpeg -hide_banner -fflags +discardcorrupt -i input.m2ts \
 -c:v libx264 -crf <crf> -preset:v medium \
 -c:a copy -bsf:a aac_adtstoasc \
 output_ff_crf-<crf>.mp4

# calculate ssim
$ ffmpeg -hide_banner -i <a> -i <b> \
 -lavfi "[0:v]settb=AVTB,setpts=PTS-STARTPTS[main];[1:v]settb=AVTB,setpts=PTS-STARTPTS[ref];[main][ref]ssim" \
 -f null -
</b></a></crf></crf>


The results of the SSIM



(a) A=input.m2ts, B=input.m2ts, ssim=0.973266
(b) A=input.m2ts, B=output_ff_crf-0.mp4, ssim=0.813347
(c) A=input.m2ts, B=output_ff_crf-30.mp4, ssim=0.819897
(d) A=output_ff_crf-0.mp4, B=output_ff_crf-0.mp4, ssim=1.000000
(e) A=output_ff_crf-0.mp4, B=output_ff_crf-30.mp4, ssim=0.972911



- 

- (d)(e) : These are what I expected.
- (a) : The files are the same, but ssim≠1.
- (b)(c) : SSIMs with CRF=0 and CRF=30 have almost the same value, although the image quality is different.









In the case of HandBrakeCLI



To determine if there was a problem with input.m2ts, I ran HandBrakeCLI with almost the same parameters as ffmpeg.



# encode
HandBrakeCLI --verbose --format av_mp4 --encoder x264 --quality <crf> --x264-preset medium \
 --aencoder copy \
 --input input.m2ts --output output_hb_crf-<crf>.mp4

# calculate ssim (same as ffmpeg)
$ ffmpeg -hide_banner -i <a> -i <b> \
 -lavfi "[0:v]settb=AVTB,setpts=PTS-STARTPTS[main];[1:v]settb=AVTB,setpts=PTS-STARTPTS[ref];[main][ref]ssim" \
 -f null -
</b></a></crf></crf>


(b') A=input.m2ts, B=output_hb_crf-0.mp4, ssim=0.999999
(c') A=input.m2ts, B=output_hb_crf-30.mp4, ssim=0.972886
(d') A=output_hb_crf-0.mp4, B=output_hb_crf-0.mp4, ssim=1.000000
(e') A=output_hb_crf-0.mp4, B=output_hb_crf-30.mp4, ssim=0.972886



It's all as I expected. (although A is not ssim=1.0) 
Therefore, I don't see a problem with input.m2ts.



Informations about video files and tools



Results of the ffprobe



input.m2ts



[mpeg2video @ 0x5655577c1680] Invalid frame dimensions 0x0.
 Last message repeated 1 times
[mpegts @ 0x5655577bd080] start time for stream 2 is not set in estimate_timings_from_pts
[mpegts @ 0x5655577bd080] PES packet size mismatch
Input #0, mpegts, from 'input.m2ts':
 Duration: 00:30:02.68, start: 39593.392600, bitrate: 19019 kb/s
 Program 211
 Stream #0:0[0x140]: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002), yuv420p(tv, bt709, top first), 1920x1080 [SAR 1:1 DAR 16:9], 29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc
 Stream #0:1[0x141]: Audio: aac (LC) ([15][0][0][0] / 0x000F), 48000 Hz, stereo, fltp, 255 kb/s
 Stream #0:2[0x138]: Data: bin_data ([6][0][0][0] / 0x0006)
Unsupported codec with id 100359 for input stream 2



output_ff_crf-0.mp4



Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'output_ff_crf-0.mp4':
 Metadata:
 major_brand : isom
 minor_version : 512
 compatible_brands: isomiso2avc1mp41
 encoder : Lavf57.83.100
 Duration: 00:30:02.67, start: 0.000000, bitrate: 109301 kb/s
 Stream #0:0(und): Video: h264 (High 4:4:4 Predictive) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 109040 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc (default)
 Metadata:
 handler_name : VideoHandler
 Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 252 kb/s (default)
 Metadata:
 handler_name : SoundHandler



output_hb_crf-0.mp4



Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'output_hb_crf-0.mp4':
 Metadata:
 major_brand : mp42
 minor_version : 512
 compatible_brands: isomiso2avc1mp41
 creation_time : 2020-05-17T06:22:06.000000Z
 encoder : HandBrake 1.1.0 2018042400
 Duration: 00:30:02.22, start: 0.000000, bitrate: 109661 kb/s
 Stream #0:0(und): Video: h264 (High 4:4:4 Predictive) (avc1 / 0x31637661), yuv420p(tv, bt709), 1920x1080 [SAR 1:1 DAR 16:9], 109405 kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 180k tbc (default)
 Metadata:
 creation_time : 2020-05-17T06:22:06.000000Z
 handler_name : VideoHandler
 Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 252 kb/s (default)
 Metadata:
 creation_time : 2020-05-17T06:22:06.000000Z
 handler_name : Stereo



Tools



version



- 

- ffmpeg : 3.4.6-0ubuntu0.18.04.1
- HandBrakeCLI : 1.1.0







ldd



$ ldd /usr/bin/ffmpeg
...
libx264.so.152 => /usr/lib/x86_64-linux-gnu/libx264.so.152 (0x00007efbf1f33000)
...

$ ldd /usr/bin/HandBrakeCLI
...
libx264.so.152 => /usr/lib/x86_64-linux-gnu/libx264.so.152 (0x00007efbfb38f000)
...



ffmpeg and HandBrakeCLI are using the same libx264.


-
avformat/mpegts : Shuffle avio_seek
7 mai 2020, par Michael Niedermayeravformat/mpegts : Shuffle avio_seek
This avoids accessing an old, no longer valid buffer.
Fixes : out of array access
Fixes : crash_audio-2020Found-by : le wu <shoulewoba@gmail.com>
Reviewed-by : Marton Balint <cus@passwd.hu>
Signed-off-by : Michael Niedermayer <michael@niedermayer.cc> -
Evolution #4493 (Nouveau) : Ajouter des robots à l’écran de sécurité
17 mai 2020Bonjour,
J’ai quelques sites qui ont des nombres de visites bizarres (trop grand, d’un facteur 10 à 30 certains jours).
J’ai fait un patch : https://git.spip.net/RealET/spip/commit/ce2ce832b697ab0754a78e0fc8b298ae1e9c992b
Mais je ne sais pas comment en faire un PR.Pour info, voici un extrait d’awstats pour le serveur concerné :
Pour info :
MJ12bot 2 241 164+29470 32.60 Go 17 Mai 2020 - 11:50
AhrefsBot 1 388 315+9242 28.07 Go 17 Mai 2020 - 11:50
SemrushBot 1 251 075+74309 23.91 Go 17 Mai 2020 - 11:50
bingbot 619 488+28872 22.38 Go 17 Mai 2020 - 11:50
DotBot 394 445+7038 22.52 Go 17 Mai 2020 - 11:50
Googlebot 297 801+35895 11.64 Go 17 Mai 2020 - 11:50
crawl 243 784+325 4.66 Go 17 Mai 2020 - 11:39
MegaIndex.ru 172 567+51 5.41 Go 17 Mai 2020 - 04:50
BLEXBot 161 178+4405 4.24 Go 17 Mai 2020 - 06:42
Applebot 136 660+2443 3.20 Go 17 Mai 2020 - 11:50
robot 129 533+3017 7.80 Go 17 Mai 2020 - 11:50
empty user agent string 117 782+778 6.55 Go 17 Mai 2020 - 11:49
Firefox version 10 and lower - various robots 106 252+366 1.87 Go 17 Mai 2020 - 11:50
qwantify 83 743+3013 3.61 Go 17 Mai 2020 - 11:50
Unknown robot identified by bot* 53 246+1846 2.25 Go 17 Mai 2020 - 11:37
spip 46 253 554.75 Mo 17 Mai 2020 - 11:50
link 44 510+567 761.38 Mo 17 Mai 2020 - 11:50
Googlebot-Image 36 704 1.24 Go 17 Mai 2020 - 11:48
facebookexternalhit 35 176+1 1.31 Go 17 Mai 2020 - 11:49
MSIE 6 - ( Rogue Robot ) 33 090 1.10 Go 17 Mai 2020 - 11:47
YandexBot 21 272+9245 822.57 Mo 17 Mai 2020 - 11:50
Unknown robot (identified by hit on robots.txt) 0+27213 98.21 Mo 17 Mai 2020 - 11:48
LinkpadBot 17 954 289.02 Mo 17 Mai 2020 - 06:46
infobot 15 038+1887 198.28 Mo 17 Mai 2020 - 04:19
MSIE 5 - ( Rogue Robot ) 16 110+1 980.04 Mo 17 Mai 2020 - 11:18
Sogou web spider 14 514+453 239.14 Mo 17 Mai 2020 - 11:49
ltx71 10 593+3663 378.89 Mo 17 Mai 2020 - 11:50
BingPreview 11 920 1.87 Go 17 Mai 2020 - 11:40
nbot 8 476+1023 230.66 Mo 17 Mai 2020 - 11:42
Apache-HttpClient 7 897+43 99.64 Mo 17 Mai 2020 - 11:01
Curl 7 752 151.93 Mo 17 Mai 2020 - 11:49
CFNetwork 7 313 779.65 Mo 17 Mai 2020 - 11:25
core 7 295+2 174.93 Mo 17 Mai 2020 - 11:35
oBot 7 064+230 338.14 Mo 17 Mai 2020 - 08:06
SeznamBot 3 677+3204 148.02 Mo 16 Mai 2020 - 22:36
twitterbot 4 264+2518 100.64 Mo 17 Mai 2020 - 11:44
panscient 6 298+397 97.66 Mo 17 Mai 2020 - 06:37
A PHP script 6 395 13.36 Mo 17 Mai 2020 - 11:50
archive.org_bot 4 917+385 157.65 Mo 17 Mai 2020 - 11:50
vagabondo 5 022+12 197.93 Mo 17 Mai 2020 - 09:58
Feedfetcher-Google 4 808 137.78 Mo 17 Mai 2020 - 11:41
zend_http_client 4 535 20.98 Mo 17 Mai 2020 - 11:34
ia_archiver 4 411+98 302.37 Mo 17 Mai 2020 - 03:58
feed 4 401 127.40 Mo 17 Mai 2020 - 11:45
dataprovider.com 4 003+167 169.38 Mo 17 Mai 2020 - 10:31
universalfeedparser 4 156 82.26 Mo 17 Mai 2020 - 11:36
Baidu ( catchall ) 3 956 260.02 Mo 17 Mai 2020 - 11:11
coccoc 1 509+2374 33.71 Mo 17 Mai 2020 - 10:37
python 3 607+87 54.82 Mo 17 Mai 2020 - 11:44
Mail.RU Bot 1 969+1492 177.25 Mo 17 Mai 2020 - 11:13
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