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Revolution of Open-source and film making towards open film making
6 octobre 2011, par
Mis à jour : Juillet 2013
Langue : English
Type : Texte
Autres articles (96)
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18 février 2011, parMultilang est un plugin supplémentaire qui n’est pas activé par défaut lors de l’initialisation de MediaSPIP.
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Sur d’autres sites (9907)
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ffmpeg concat + scale2ref, reduced framerate
15 décembre 2020, par Erwan DouailleI would like to concatenate multiple videos with differents aspect ratio, framerates, etc.
The working solution is scale2ref option with black background, no re-scale and concat.


If I use my command line with movie1.mp4 (30fps 1920x1080 2sec) and movie2.mp4 (25fps 800x600 3sec) I except a final output at 25fps 1920x1080 5sec. This part works well.


Then if I use my command line with movie1.mp4 (30fps 1920x1080 2sec) and movie2.mp4 (30fps 1920x1080 3sec) I except a final output at 30fps 1920x1080 5sec. But for an unknown reason my final output is 25fps 1920x1080 5 sec.


I tried with a copy of movie1.mp4 and rename it to movie2.mp4 to ensure they are both perfectly identical and got the same issue.


Input #0, lavfi, from 'color':
 Duration: N/A, start: 0.000000, bitrate: N/A
 Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 320x240 [SAR 1:1 DAR 4:3], 25 tbr, 25 tbn, 25 tbc
Input #1, mov,mp4,m4a,3gp,3g2,mj2, from './1.mp4':
 Metadata:
 major_brand : isom
 minor_version : 512
 compatible_brands: isomiso2avc1mp41
 encoder : Lavf58.29.100
 Duration: 00:00:02.47, start: 0.000000, bitrate: 6737 kb/s
 Stream #1:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 6567 kb/s, 30 fps, 30 tbr, 90k tbn, 60 tbc (default)
 Metadata:
 handler_name : VideoHandler
 Stream #1:1(und): Audio: mp3 (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 160 kb/s (default)
 Metadata:
 handler_name : SoundHandler
Input #2, mov,mp4,m4a,3gp,3g2,mj2, from './2.mp4':
 Metadata:
 major_brand : isom
 minor_version : 512
 compatible_brands: isomiso2avc1mp41
 encoder : Lavf58.29.100
 Duration: 00:00:02.47, start: 0.000000, bitrate: 6737 kb/s
 Stream #2:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 6567 kb/s, 30 fps, 30 tbr, 90k tbn, 60 tbc (default)
 Metadata:
 handler_name : VideoHandler
 Stream #2:1(und): Audio: mp3 (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 160 kb/s (default)
 Metadata:
 handler_name : SoundHandler



Output file :


[libx264 @ 000001a689d44180] using SAR=1/1
[libx264 @ 000001a689d44180] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 000001a689d44180] profile High, level 4.0, 4:2:0, 8-bit
[libx264 @ 000001a689d44180] 264 - core 160 - H.264/MPEG-4 AVC codec - Copyleft 2003-2020 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=24 lookahead_threads=4 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to './out.mp4':
 Metadata:
 encoder : Lavf58.29.100
 Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], q=-1--1, 25 fps, 12800 tbn, 25 tbc (default)
 Metadata:
 encoder : Lavc58.54.100 libx264
 Side data:
 cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
 Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)
 Metadata:
 handler_name : SoundHandler
 encoder : Lavc58.54.100 aac
frame= 124 fps= 72 q=-1.0 Lsize= 3842kB time=00:00:04.84 bitrate=6502.6kbits/s speed=2.79x



Here is my command line :


ffmpeg -y -f lavfi -i color -i ./1.mp4 -i ./2.mp4 -filter_complex_script ./3.txt ./out.mp4



The content of filter comple script :


[0][1]scale2ref[canvas][vid1];[canvas][2]scale2ref='max(iw,main_w)':'max(ih,main_h)'[canvas][vid2];[canvas]split=2[canvas1][canvas2];[canvas1][vid1]overlay=x='(W-w)/2':y='(H-h)/2':shortest=1[vid1];[canvas2][vid2]overlay=x='(W-w)/2':y='(H-h)/2':shortest=1[vid2];[vid1][vid2]concat=n=2:v=1,setsar=1



I´m quite sure it´s related to the lavfi input but I don´t know how to enforce it to be the best framerate available.


Is it possible to enforce the "best" framerate available ?
Something like :


- 

- 30fps + 30fps = 30fps
- 25fps + 25fps = 25fps
- 25fps + 30fps = 30fps (or maybe 25 with perfect down sampling for the 30fps video)








My ffmpeg commands are programmaticaly generated. Any automatic solution is prefered.


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h.264 lossless video in python with ffmpeg
7 mars 2015, par OjtwistI have raw video files which I encoded via ffmpeg (lossless) :
ffmpeg -i test.avi -c:v libx264 -preset veryslow -crf 0 output.mkv
Now I tried to read these in python :
FFMPEG_BIN = "ffmpeg"
command = [FFMPEG_BIN,
'-i',path,
'-f', 'image2pipe',
'-pix_fmt','yuv444p',
'-r',framerate,
'-ss',startposition,
'-vcodec','rawvideo','-']
pipe = sp.Popen(command,stdout=sp.PIPE,bufsize=10**8)
while True:
raw_image = pipe.stdout.read(640*480*3)
image = np.fromstring(raw_image,dtype='uint8')
image = image.reshape((480,640,3))I can’t find the good command to get the video lossless in python. If I try it as mentioned above and show it with matplotlib, I get :
If I set -
vcodec
tolibx264
I get noise.If i set
-pix_fmt
torgb24
, I get a normal looking image, but I can see some artifact due to the color conversion.What is the command I am looking for ?
extra info, the output of the encoding (initial raw video ==> lossless h.264) :
worker@worklati:~/data/DMG/test$ ffmpeg -i test.avi -c:v libx264 -preset veryslow -crf 0 output.mkv
ffmpeg version 2.5.3 Copyright (c) 2000-2015 the FFmpeg developers
built on Jan 11 2015 17:53:45 with gcc 4.8 (Ubuntu 4.8.2-19ubuntu1)
configuration: --extra-libs=-ldl --prefix=/opt/ffmpeg --enable-avresample --disable-debug --enable-nonfree --enable-gpl --enable-version3 --enable-libpulse --enable-libopencore-amrnb --enable-libopencore-amrwb --disable-decoder=amrnb --disable-decoder=amrwb --enable-libx264 --enable-libx265 --enable-libfdk-aac --enable-libvorbis --enable-libmp3lame --enable-libopus --enable-libvpx --enable-libspeex --enable-libass --enable-avisynth --enable-libsoxr --enable-libxvid --enable-libvo-aacenc --enable-libvidstab
libavutil 54. 15.100 / 54. 15.100
libavcodec 56. 13.100 / 56. 13.100
libavformat 56. 15.102 / 56. 15.102
libavdevice 56. 3.100 / 56. 3.100
libavfilter 5. 2.103 / 5. 2.103
libavresample 2. 1. 0 / 2. 1. 0
libswscale 3. 1.101 / 3. 1.101
libswresample 1. 1.100 / 1. 1.100
libpostproc 53. 3.100 / 53. 3.100
Input #0, avi, from 'test.avi':
Duration: 00:10:25.17, start: 0.000000, bitrate: 44237 kb/s
Stream #0:0: Video: rawvideo, bgr24, 640x480, 6 fps, 6 tbr, 6 tbn, 6 tbc
File 'output.mkv' already exists. Overwrite ? [y/N] y
No pixel format specified, yuv444p for H.264 encoding chosen.
Use -pix_fmt yuv420p for compatibility with outdated media players.
[libx264 @ 0x1fd7160] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX AVX2 FMA3 LZCNT BMI2
[libx264 @ 0x1fd7160] profile High 4:4:4 Predictive, level 3.2, 4:4:4 8-bit
[libx264 @ 0x1fd7160] 264 - core 142 r2389 956c8d8 - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 - http://www.videolan.org/x264.html - options: cabac=1 ref=16 deblock=1:0:0 analyse=0x3:0x133 me=umh subme=9 psy=0 mixed_ref=1 me_range=24 chroma_me=1 trellis=0 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=0 chroma_qp_offset=0 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=2 keyint=250 keyint_min=6 scenecut=40 intra_refresh=0 rc=cqp mbtree=0 qp=0
Output #0, matroska, to 'output.mkv':
Metadata:
encoder : Lavf56.15.102
Stream #0:0: Video: h264 (libx264) (H264 / 0x34363248), yuv444p, 640x480, q=-1--1, 6 fps, 1k tbn, 6 tbc
Metadata:
encoder : Lavc56.13.100 libx264
Stream mapping:
Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (libx264))
Press [q] to stop, [?] for help
frame= 3751 fps= 40 q=-1.0 Lsize= 133724kB time=00:10:25.16 bitrate=1752.3kbits/s
video:133691kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.024307%
[libx264 @ 0x1fd7160] frame I:16 Avg QP: 0.00 size: 58298
[libx264 @ 0x1fd7160] frame P:3735 Avg QP: 0.00 size: 36403
[libx264 @ 0x1fd7160] mb I I16..4: 65.3% 6.9% 27.7%
[libx264 @ 0x1fd7160] mb P I16..4: 3.0% 2.1% 0.2% P16..4: 71.2% 0.8% 22.4% 0.0% 0.0% skip: 0.1%
[libx264 @ 0x1fd7160] 8x8 transform intra:36.9% inter:49.5%
[libx264 @ 0x1fd7160] coded y,u,v intra: 79.3% 0.0% 0.0% inter: 97.6% 0.0% 0.0%
[libx264 @ 0x1fd7160] i16 v,h,dc,p: 20% 3% 76% 1%
[libx264 @ 0x1fd7160] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 5% 8% 80% 1% 1% 2% 1% 1% 1%
[libx264 @ 0x1fd7160] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 23% 28% 16% 5% 7% 8% 5% 4% 5%
[libx264 @ 0x1fd7160] Weighted P-Frames: Y:0.2% UV:0.0%
[libx264 @ 0x1fd7160] ref P L0: 63.2% 0.0% 14.2% 5.3% 4.0% 3.2% 2.6% 1.1% 1.0% 1.0% 0.9% 1.1% 0.7% 0.6% 0.6% 0.6%
[libx264 @ 0x1fd7160] kb/s:1751.85 -
ffmpeg. Segmentation fault when input process end
24 mars 2020, par mr.NobodyIm using xvfb-run with katalon cli command to execute selenium tests inside docker container (ubuntu 16)
xvfb-run --listen-tcp --server-num 44 --auth-file /tmp/xvfb.auth -s '-ac -screen 0 1024x768x24' katalon -browserType=Firefox -retry=0 -statusDelay=15 -testSuitePath=Test Suites/Full_cases -runMode=console -reportFolder=/katalon/report -projectPath=/katalon/project.prj &
and ffmpeg command to record video
ffmpeg -y -f x11grab -video_size 1024x768 -i :44 -codec:v libx264 -r 12 /katalon/report/output_2.mp4
But when the xvf-run process ends i have a ffmpeg segmentation fault error. Output file doesn’t save.
ffmpeg version 2.8.15-0ubuntu0.16.04.1 Copyright (c) 2000-2018 the FFmpeg developers
built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.10) 20160609
configuration: --prefix=/usr --extra-version=0ubuntu0.16.04.1 --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --cc=cc --cxx=g++ --enable-gpl --enable-shared --disable-stripping --disable-decoder=libopenjpeg --disable-decoder=libschroedinger --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxvid --enable-libzvbi --enable-openal --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzmq --enable-frei0r --enable-libx264 --enable-libopencv
libavutil 54. 31.100 / 54. 31.100
libavcodec 56. 60.100 / 56. 60.100
libavformat 56. 40.101 / 56. 40.101
libavdevice 56. 4.100 / 56. 4.100
libavfilter 5. 40.101 / 5. 40.101
libavresample 2. 1. 0 / 2. 1. 0
libswscale 3. 1.101 / 3. 1.101
libswresample 1. 2.101 / 1. 2.101
libpostproc 53. 3.100 / 53. 3.100
Input #0, x11grab, from ':44':
Duration: N/A, start: 1584962410.149890, bitrate: N/A
Stream #0:0: Video: rawvideo (BGR[0] / 0x524742), bgr0, 1024x768, 29.97 fps, 29.97 tbr, 1000k tbn, 29.97 tbc
No pixel format specified, yuv444p for H.264 encoding chosen.
Use -pix_fmt yuv420p for compatibility with outdated media players.
[libx264 @ 0x15e1a80] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 AVX2 LZCNT BMI2
[libx264 @ 0x15e1a80] profile High 4:4:4 Predictive, level 3.1, 4:4:4 8-bit
[libx264 @ 0x15e1a80] 264 - core 148 r2643 5c65704 - H.264/MPEG-4 AVC codec - Copyleft 2003-2015 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=4 threads=9 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=12 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to '/katalon/katalon/report/behat_2.mp4':
Metadata:
encoder : Lavf56.40.101
Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv444p, 1024x768, q=-1--1, 12 fps, 12288 tbn, 12 tbc
Metadata:
encoder : Lavc56.60.100 libx264
Stream mapping:
Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (libx264))
Press [q] to stop, [?] for help
Segmentation fault2 q=26.0 size= 548kB time=00:00:53.08 bitrate= 84.5kbits/s dup=1 drop=1033My decision how to save video is send "q" keyword before the xvfb-run ends, but this is very uncomfortable