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Sintel MP4 Surround 5.1 Full
13 mai 2011, par
Mis à jour : Février 2012
Langue : English
Type : Video
Autres articles (32)
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La sauvegarde automatique de canaux SPIP
1er avril 2010, parDans le cadre de la mise en place d’une plateforme ouverte, il est important pour les hébergeurs de pouvoir disposer de sauvegardes assez régulières pour parer à tout problème éventuel.
Pour réaliser cette tâche on se base sur deux plugins SPIP : Saveauto qui permet une sauvegarde régulière de la base de donnée sous la forme d’un dump mysql (utilisable dans phpmyadmin) mes_fichiers_2 qui permet de réaliser une archive au format zip des données importantes du site (les documents, les éléments (...) -
Script d’installation automatique de MediaSPIP
25 avril 2011, parAfin de palier aux difficultés d’installation dues principalement aux dépendances logicielles coté serveur, un script d’installation "tout en un" en bash a été créé afin de faciliter cette étape sur un serveur doté d’une distribution Linux compatible.
Vous devez bénéficier d’un accès SSH à votre serveur et d’un compte "root" afin de l’utiliser, ce qui permettra d’installer les dépendances. Contactez votre hébergeur si vous ne disposez pas de cela.
La documentation de l’utilisation du script d’installation (...) -
Automated installation script of MediaSPIP
25 avril 2011, parTo overcome the difficulties mainly due to the installation of server side software dependencies, an "all-in-one" installation script written in bash was created to facilitate this step on a server with a compatible Linux distribution.
You must have access to your server via SSH and a root account to use it, which will install the dependencies. Contact your provider if you do not have that.
The documentation of the use of this installation script is available here.
The code of this (...)
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ffmpeg - Take Frame Accurate Screenshot
20 septembre 2019, par miketrying to find a way to take frame accurate screenshots with ffmpeg WITHOUT re-encoding the video.
When I use :
ffmpeg -ss -i input -vframes 1 -q:v 2 output.jpgwith -ss being hh:mm:ss.ms, not matter how I specify the milliseconds, it is never frame accurate with this command. it seems to be landing on the nearest keyframe (which is not accurate enough for my application).
So, my question is :
Without re-encoding the video (ergo specifying -ss flag AFTER the input) is there any way to pull frame accurate screenshots via ffmpeg ?
If not, is there another solution on Windows that would allow that via command line ?
Thanks !
ffmpeg log report part 1 :
ffmpeg started on 2018-01-22 at 02:52:59
Report written to "ffmpeg-20180122-025259.log"
Command line:
"D:\\ffmpeg-3.4.1-win64-static\\bin\\ffmpeg.exe" -ss 1:31:25.9885 -i "V:\\Test\\BDMV\\STREAM\\00000.m2ts" -vframes 1 -q:v 2 -report output.jpg
ffmpeg version N-89674-g57d0c24132 Copyright (c) 2000-2018 the FFmpeg developers
built with gcc 7.2.0 (GCC)
configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-bzlib --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-amf --enable-cuda --enable-cuvid --enable-d3d11va --enable-nvenc --enable-dxva2 --enable-avisynth --enable-libmfx
libavutil 56. 7.100 / 56. 7.100
libavcodec 58. 9.100 / 58. 9.100
libavformat 58. 3.100 / 58. 3.100
libavdevice 58. 0.100 / 58. 0.100
libavfilter 7. 8.100 / 7. 8.100
libswscale 5. 0.101 / 5. 0.101
libswresample 3. 0.101 / 3. 0.101
libpostproc 55. 0.100 / 55. 0.100
Splitting the commandline.
Reading option '-ss' ... matched as option 'ss' (set the start time offset) with argument '1:31:25.9885'.
Reading option '-i' ... matched as input url with argument 'V:\Test\BDMV\STREAM\00000.m2ts'.
Reading option '-vframes' ... matched as option 'vframes' (set the number of video frames to output) with argument '1'.
Reading option '-q:v' ... matched as option 'q' (use fixed quality scale (VBR)) with argument '2'.
Reading option '-report' ... matched as option 'report' (generate a report) with argument '1'.
Reading option 'output.jpg' ... matched as output url.
Finished splitting the commandline.
Parsing a group of options: global .
Applying option report (generate a report) with argument 1.
Successfully parsed a group of options.
Parsing a group of options: input url V:\Test\BDMV\STREAM\00000.m2ts.
Applying option ss (set the start time offset) with argument 1:31:25.9885.
Successfully parsed a group of options.
Opening an input file: V:\Test\BDMV\STREAM\00000.m2ts.
[NULL @ 000001e53135a680] Opening 'V:\Test\BDMV\STREAM\00000.m2ts' for reading
[file @ 000001e53135b740] Setting default whitelist 'file,crypto'
[mpegts @ 000001e53135a680] Format mpegts probed with size=2048 and score=50
[mpegts @ 000001e53135a680] stream=0 stream_type=1b pid=1011 prog_reg_desc=HDMV
[mpegts @ 000001e53135a680] stream=1 stream_type=86 pid=1100 prog_reg_desc=HDMV
[mpegts @ 000001e53135a680] stream=2 stream_type=90 pid=1200 prog_reg_desc=HDMV
[mpegts @ 000001e53135a680] Before avformat_find_stream_info() pos: 0 bytes read:32768 seeks:0 nb_streams:3
[mpegts @ 000001e53135a680] parser not found for codec hdmv_pgs_subtitle, packets or times may be invalid.
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[AVBSFContext @ 000001e5313b4380] nal_unit_type: 9, nal_ref_idc: 0
[AVBSFContext @ 000001e5313b4380] nal_unit_type: 7, nal_ref_idc: 3
[AVBSFContext @ 000001e5313b4380] nal_unit_type: 8, nal_ref_idc: 3
[AVBSFContext @ 000001e5313b4380] nal_unit_type: 6, nal_ref_idc: 0
[AVBSFContext @ 000001e5313b4380] nal_unit_type: 6, nal_ref_idc: 0
[AVBSFContext @ 000001e5313b4380] nal_unit_type: 5, nal_ref_idc: 3
[AVBSFContext @ 000001e5313b4380] nal_unit_type: 5, nal_ref_idc: 3
[AVBSFContext @ 000001e5313b4380] nal_unit_type: 5, nal_ref_idc: 3
[AVBSFContext @ 000001e5313b4380] nal_unit_type: 5, nal_ref_idc: 3
[h264 @ 000001e53135c940] nal_unit_type: 9, nal_ref_idc: 0
[h264 @ 000001e53135c940] nal_unit_type: 7, nal_ref_idc: 3
[h264 @ 000001e53135c940] nal_unit_type: 8, nal_ref_idc: 3
[h264 @ 000001e53135c940] nal_unit_type: 6, nal_ref_idc: 0
[h264 @ 000001e53135c940] nal_unit_type: 6, nal_ref_idc: 0
[h264 @ 000001e53135c940] nal_unit_type: 5, nal_ref_idc: 3
[h264 @ 000001e53135c940] nal_unit_type: 5, nal_ref_idc: 3
[h264 @ 000001e53135c940] nal_unit_type: 5, nal_ref_idc: 3
[h264 @ 000001e53135c940] nal_unit_type: 5, nal_ref_idc: 3
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] Format yuv420p chosen by get_format().
[h264 @ 000001e53135c940] Reinit context to 1920x1088, pix_fmt: yuv420p
[h264 @ 000001e53135c940] no picture
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[h264 @ 000001e53135c940] ct_type:0 pic_struct:0
[mpegts @ 000001e53135a680] max_analyze_duration 7000000 reached at 7008000 microseconds st:1
[mpegts @ 000001e53135a680] rfps: 23.916667 0.014415
[mpegts @ 000001e53135a680] rfps: 23.916667 0.014415
[mpegts @ 000001e53135a680] rfps: 24.000000 0.002352
[mpegts @ 000001e53135a680] rfps: 24.000000 0.007275
[mpegts @ 000001e53135a680] rfps: 48.000000 0.009407
[mpegts @ 000001e53135a680] rfps: 48.000000 0.013337
[mpegts @ 000001e53135a680] rfps: 23.976024 0.000000
[mpegts @ 000001e53135a680] rfps: 23.976024 0.000000
[mpegts @ 000001e53135a680] rfps: 47.952048 0.000000
[mpegts @ 000001e53135a680] rfps: 47.952048 0.000000
[mpegts @ 000001e53135a680] start time for stream 2 is not set in estimate_timings_from_pts
[mpegts @ 000001e53135a680] Could not find codec parameters for stream 2 (Subtitle: hdmv_pgs_subtitle (pgssub) ([144][0][0][0] / 0x0090)): unspecified size
Consider increasing the value for the 'analyzeduration' and 'probesize' options
[mpegts @ 000001e53135a680] After avformat_find_stream_info() pos: 0 bytes read:2494608 seeks:2 frames:828
[NULL @ 000001e53135c940] nal_unit_type: 7, nal_ref_idc: 3
[NULL @ 000001e53135c940] nal_unit_type: 8, nal_ref_idc: 3
[NULL @ 000001e53135c940] ct_type:0 pic_struct:0
[NULL @ 000001e53135c940] nal_unit_type: 7, nal_ref_idc: 3
[NULL @ 000001e53135c940] nal_unit_type: 8, nal_ref_idc: 3
[NULL @ 000001e53135c940] nal_unit_type: 7, nal_ref_idc: 3
[NULL @ 000001e53135c940] nal_unit_type: 8, nal_ref_idc: 3
[NULL @ 000001e53135c940] ct_type:0 pic_struct:0
[NULL @ 000001e53135c940] nal_unit_type: 7, nal_ref_idc: 3
[NULL @ 000001e53135c940] nal_unit_type: 8, nal_ref_idc: 3
[NULL @ 000001e53135c940] ct_type:0 pic_struct:0
[NULL @ 000001e53135c940] ct_type:0 pic_struct:0
[NULL @ 000001e53135c940] nal_unit_type: 7, nal_ref_idc: 3
[NULL @ 000001e53135c940] nal_unit_type: 8, nal_ref_idc: 3
[NULL @ 000001e53135c940] ct_type:0 pic_struct:0
[NULL @ 000001e53135c940] ct_type:0 pic_struct:0
[NULL @ 000001e53135c940] nal_unit_type: 7, nal_ref_idc: 3
[NULL @ 000001e53135c940] nal_unit_type: 8, nal_ref_idc: 3
[NULL @ 000001e53135c940] ct_type:0 pic_struct:0
[NULL @ 000001e53135c940] ct_type:0 pic_struct:0
[NULL @ 000001e53135c940] nal_unit_type: 7, nal_ref_idc: 3
[NULL @ 000001e53135c940] nal_unit_type: 8, nal_ref_idc: 3
[NULL @ 000001e53135c940] ct_type:0 pic_struct:0
[NULL @ 000001e53135c940] nal_unit_type: 7, nal_ref_idc: 3
[NULL @ 000001e53135c940] nal_unit_type: 8, nal_ref_idc: 3
[NULL @ 000001e53135c940] ct_type:0 pic_struct:0
[NULL @ 000001e53135c940] nal_unit_type: 7, nal_ref_idc: 3
[NULL @ 000001e53135c940] nal_unit_type: 8, nal_ref_idc: 3
[NULL @ 000001e53135c940] ct_type:0 pic_struct:0
[NULL @ 000001e53135c940] nal_unit_type: 7, nal_ref_idc: 3
[NULL @ 000001e53135c940] nal_unit_type: 8, nal_ref_idc: 3
[NULL @ 000001e53135c940] ct_type:0 pic_struct:0
[NULL @ 000001e53135c940] nal_unit_type: 7, nal_ref_idc: 3
[NULL @ 000001e53135c940] nal_unit_type: 8, nal_ref_idc: 3
[NULL @ 000001e53135c940] ct_type:0 pic_struct:0
[NULL @ 000001e53135c940] nal_unit_type: 7, nal_ref_idc: 3
[NULL @ 000001e53135c940] nal_unit_type: 8, nal_ref_idc: 3
[NULL @ 000001e53135c940] ct_type:0 pic_struct:0
[NULL @ 000001e53135c940] nal_unit_type: 7, nal_ref_idc: 3
[NULL @ 000001e53135c940] nal_unit_type: 8, nal_ref_idc: 3
[NULL @ 000001e53135c940] ct_type:0 pic_struct:0
[NULL @ 000001e53135c940] ct_type:0 pic_struct:0
Input #0, mpegts, from 'V:\Test\BDMV\STREAM\00000.m2ts':
Duration: 01:39:08.15, start: 600.000000, bitrate: 25263 kb/s
Program 1
Stream #0:0[0x1011], 169, 1/90000: Video: h264 (High) (HDMV / 0x564D4448), yuv420p(progressive), 1920x1080 [SAR 1:1 DAR 16:9], 23.98 fps, 23.98 tbr, 90k tbn, 47.95 tbc
Stream #0:1[0x1100], 659, 1/90000: Audio: dts (DTS-HD MA) ([134][0][0][0] / 0x0086), 48000 Hz, stereo, s16p
Stream #0:2[0x1200], 0, 1/90000: Subtitle: hdmv_pgs_subtitle ([144][0][0][0] / 0x0090)
Successfully opened the file. -
c++ - using FFmpeg encode and UDP with a Webcam
14 mars, par RendresI'm trying to get frames from a Webcam using OpenCV, encode them with FFmpeg and send them using UDP.



I did before a similar project that instead of sending the packets with UDP, it saved them in a video file.



My code is.



#include 
#include 
#include 
#include 

extern "C" {
#include <libavcodec></libavcodec>avcodec.h>
#include <libavformat></libavformat>avformat.h>
#include <libavutil></libavutil>opt.h>
#include <libavutil></libavutil>imgutils.h>
#include <libavutil></libavutil>mathematics.h>
#include <libswscale></libswscale>swscale.h>
#include <libswresample></libswresample>swresample.h>
}

#include <opencv2></opencv2>opencv.hpp>

using namespace std;
using namespace cv;

#define WIDTH 640
#define HEIGHT 480
#define CODEC_ID AV_CODEC_ID_H264
#define STREAM_PIX_FMT AV_PIX_FMT_YUV420P

static AVFrame *frame, *pFrameBGR;

int main(int argc, char **argv)
{
VideoCapture cap(0);
const char *url = "udp://127.0.0.1:8080";

AVFormatContext *formatContext;
AVStream *stream;
AVCodec *codec;
AVCodecContext *c;
AVDictionary *opts = NULL;

int ret, got_packet;

if (!cap.isOpened())
{
 return -1;
}

av_log_set_level(AV_LOG_TRACE);

av_register_all();
avformat_network_init();

avformat_alloc_output_context2(&formatContext, NULL, "h264", url);
if (!formatContext)
{
 av_log(NULL, AV_LOG_FATAL, "Could not allocate an output context for '%s'.\n", url);
}

codec = avcodec_find_encoder(CODEC_ID);
if (!codec)
{
 av_log(NULL, AV_LOG_ERROR, "Could not find encoder.\n");
}

stream = avformat_new_stream(formatContext, codec);

c = avcodec_alloc_context3(codec);

stream->id = formatContext->nb_streams - 1;
stream->time_base = (AVRational){1, 25};

c->codec_id = CODEC_ID;
c->bit_rate = 400000;
c->width = WIDTH;
c->height = HEIGHT;
c->time_base = stream->time_base;
c->gop_size = 12;
c->pix_fmt = STREAM_PIX_FMT;

if (formatContext->flags & AVFMT_GLOBALHEADER)
 c->flags |= AV_CODEC_FLAG_GLOBAL_HEADER;

av_dict_set(&opts, "preset", "fast", 0);

av_dict_set(&opts, "tune", "zerolatency", 0);

ret = avcodec_open2(c, codec, NULL);
if (ret < 0)
{
 av_log(NULL, AV_LOG_ERROR, "Could not open video codec.\n");
}

pFrameBGR = av_frame_alloc();
if (!pFrameBGR)
{
 av_log(NULL, AV_LOG_ERROR, "Could not allocate video frame.\n");
}

frame = av_frame_alloc();
if (!frame)
{
 av_log(NULL, AV_LOG_ERROR, "Could not allocate video frame.\n");
}

frame->format = c->pix_fmt;
frame->width = c->width;
frame->height = c->height;

ret = avcodec_parameters_from_context(stream->codecpar, c);
if (ret < 0)
{
 av_log(NULL, AV_LOG_ERROR, "Could not open video codec.\n");
}

av_dump_format(formatContext, 0, url, 1);

ret = avformat_write_header(formatContext, NULL);
if (ret != 0)
{
 av_log(NULL, AV_LOG_ERROR, "Failed to connect to '%s'.\n", url);
}

Mat image(Size(HEIGHT, WIDTH), CV_8UC3);
SwsContext *swsctx = sws_getContext(WIDTH, HEIGHT, AV_PIX_FMT_BGR24, WIDTH, HEIGHT, AV_PIX_FMT_YUV420P, SWS_BILINEAR, NULL, NULL, NULL);
int frame_pts = 0;

while (1)
{
 cap >> image;

 int numBytesYUV = av_image_get_buffer_size(STREAM_PIX_FMT, WIDTH, HEIGHT, 1);
 uint8_t *bufferYUV = (uint8_t *)av_malloc(numBytesYUV * sizeof(uint8_t));

 avpicture_fill((AVPicture *)pFrameBGR, image.data, AV_PIX_FMT_BGR24, WIDTH, HEIGHT);
 avpicture_fill((AVPicture *)frame, bufferYUV, STREAM_PIX_FMT, WIDTH, HEIGHT);

 sws_scale(swsctx, (uint8_t const *const *)pFrameBGR->data, pFrameBGR->linesize, 0, HEIGHT, frame->data, frame->linesize);

 AVPacket pkt = {0};
 av_init_packet(&pkt);

 frame->pts = frame_pts;

 ret = avcodec_encode_video2(c, &pkt, frame, &got_packet);
 if (ret < 0)
 {
 av_log(NULL, AV_LOG_ERROR, "Error encoding frame\n");
 }

 if (got_packet)
 {
 pkt.pts = av_rescale_q_rnd(pkt.pts, c->time_base, stream->time_base, AVRounding(AV_ROUND_NEAR_INF | AV_ROUND_PASS_MINMAX));
 pkt.dts = av_rescale_q_rnd(pkt.dts, c->time_base, stream->time_base, AVRounding(AV_ROUND_NEAR_INF | AV_ROUND_PASS_MINMAX));
 pkt.duration = av_rescale_q(pkt.duration, c->time_base, stream->time_base);
 pkt.stream_index = stream->index;

 return av_interleaved_write_frame(formatContext, &pkt);

 cout << "Seguro que si" << endl;
 }
 frame_pts++;
}

avcodec_free_context(&c);
av_frame_free(&frame);
avformat_free_context(formatContext);

return 0;
}



The code compiles but it returns Segmentation fault in the function av_interleaved_write_frame(). I've tried several implementations or several codecs (in this case I'm using libopenh264, but using mpeg2video returns the same segmentation fault). I tried also with av_write_frame() but it returns the same error.



As I told before, I only want to grab frames from a webcam connected via USB, encode them to H264 and send the packets through UDP to another PC.



My console log when I run the executable is.



[100%] Built target display
[OpenH264] this = 0x0x244b4f0, Info:CWelsH264SVCEncoder::SetOption():ENCODER_OPTION_TRACE_CALLBACK callback = 0x7f0c302a87c0.
[libopenh264 @ 0x244aa00] [OpenH264] this = 0x0x244b4f0, Info:CWelsH264SVCEncoder::InitEncoder(), openh264 codec version = 5a5c4f1
[libopenh264 @ 0x244aa00] [OpenH264] this = 0x0x244b4f0, Info:iUsageType = 0,iPicWidth= 640;iPicHeight= 480;iTargetBitrate= 400000;iMaxBitrate= 400000;iRCMode= 0;iPaddingFlag= 0;iTemporalLayerNum= 1;iSpatialLayerNum= 1;fFrameRate= 25.000000f;uiIntraPeriod= 12;eSpsPpsIdStrategy = 0;bPrefixNalAddingCtrl = 0;bSimulcastAVC=0;bEnableDenoise= 0;bEnableBackgroundDetection= 1;bEnableSceneChangeDetect = 1;bEnableAdaptiveQuant= 1;bEnableFrameSkip= 0;bEnableLongTermReference= 0;iLtrMarkPeriod= 30, bIsLosslessLink=0;iComplexityMode = 0;iNumRefFrame = 1;iEntropyCodingModeFlag = 0;uiMaxNalSize = 0;iLTRRefNum = 0;iMultipleThreadIdc = 1;iLoopFilterDisableIdc = 0 (offset(alpha/beta): 0,0;iComplexityMode = 0,iMaxQp = 51;iMinQp = 0)
[libopenh264 @ 0x244aa00] [OpenH264] this = 0x0x244b4f0, Info:sSpatialLayers[0]: .iVideoWidth= 640; .iVideoHeight= 480; .fFrameRate= 25.000000f; .iSpatialBitrate= 400000; .iMaxSpatialBitrate= 400000; .sSliceArgument.uiSliceMode= 1; .sSliceArgument.iSliceNum= 0; .sSliceArgument.uiSliceSizeConstraint= 1500;uiProfileIdc = 66;uiLevelIdc = 41
[libopenh264 @ 0x244aa00] [OpenH264] this = 0x0x244b4f0, Warning:SliceArgumentValidationFixedSliceMode(), unsupported setting with Resolution and uiSliceNum combination under RC on! So uiSliceNum is changed to 6!
[libopenh264 @ 0x244aa00] [OpenH264] this = 0x0x244b4f0, Info:Setting MaxSpatialBitrate (400000) the same at SpatialBitrate (400000) will make the actual bit rate lower than SpatialBitrate
[libopenh264 @ 0x244aa00] [OpenH264] this = 0x0x244b4f0, Warning:bEnableFrameSkip = 0,bitrate can't be controlled for RC_QUALITY_MODE,RC_BITRATE_MODE and RC_TIMESTAMP_MODE without enabling skip frame.
[libopenh264 @ 0x244aa00] [OpenH264] this = 0x0x244b4f0, Warning:Change QP Range from(0,51) to (12,42)
[libopenh264 @ 0x244aa00] [OpenH264] this = 0x0x244b4f0, Info:WELS CPU features/capacities (0x4007fe3f) detected: HTT: Y, MMX: Y, MMXEX: Y, SSE: Y, SSE2: Y, SSE3: Y, SSSE3: Y, SSE4.1: Y, SSE4.2: Y, AVX: Y, FMA: Y, X87-FPU: Y, 3DNOW: N, 3DNOWEX: N, ALTIVEC: N, CMOV: Y, MOVBE: Y, AES: Y, NUMBER OF LOGIC PROCESSORS ON CHIP: 8, CPU CACHE LINE SIZE (BYTES): 64
[libopenh264 @ 0x244aa00] [OpenH264] this = 0x0x244b4f0, Info:WelsInitEncoderExt() exit, overall memory usage: 4542878 bytes
[libopenh264 @ 0x244aa00] [OpenH264] this = 0x0x244b4f0, Info:WelsInitEncoderExt(), pCtx= 0x0x245a400.
Output #0, h264, to 'udp://192.168.100.39:8080':
Stream #0:0, 0, 1/25: Video: h264 (libopenh264), 1 reference frame, yuv420p, 640x480 (0x0), 0/1, q=2-31, 400 kb/s, 25 tbn
[libopenh264 @ 0x244aa00] [OpenH264] this = 0x0x244b4f0, Debug:RcUpdateIntraComplexity iFrameDqBits = 385808,iQStep= 2016,iIntraCmplx = 777788928
[libopenh264 @ 0x244aa00] [OpenH264] this = 0x0x244b4f0, Debug:[Rc]Layer 0: Frame timestamp = 0, Frame type = 2, encoding_qp = 30, average qp = 30, max qp = 33, min qp = 27, index = 0, iTid = 0, used = 385808, bitsperframe = 16000, target = 64000, remainingbits = -257808, skipbuffersize = 200000
[libopenh264 @ 0x244aa00] [OpenH264] this = 0x0x244b4f0, Debug:WelsEncoderEncodeExt() OutputInfo iLayerNum = 2,iFrameSize = 48252
[libopenh264 @ 0x244aa00] [OpenH264] this = 0x0x244b4f0, Debug:WelsEncoderEncodeExt() OutputInfo iLayerId = 0,iNalType = 0,iNalCount = 2, first Nal Length=18,uiSpatialId = 0,uiTemporalId = 0,iSubSeqId = 0
[libopenh264 @ 0x244aa00] [OpenH264] this = 0x0x244b4f0, Debug:WelsEncoderEncodeExt() OutputInfo iLayerId = 1,iNalType = 1,iNalCount = 6, first Nal Length=6057,uiSpatialId = 0,uiTemporalId = 0,iSubSeqId = 0
[libopenh264 @ 0x244aa00] 6 slices
./scriptBuild.sh: line 20: 10625 Segmentation fault (core dumped) ./display



As you can see, FFmpeg uses libopenh264 and configures it correctly. However, no matter what. It always returns the same Segmentation fault error...



I've used commands like this.



ffmpeg -s 640x480 -f video4linux2 -i /dev/video0 -r 30 -vcodec libopenh264 -an -f h264 udp://127.0.0.1:8080



And it works perfectly, but I need to process the frames before sending them. Thats why I'm trying to use the libs.



My FFmpeg version is.



ffmpeg version 3.3.6 Copyright (c) 2000-2017 the FFmpeg developers
built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04.3)
configuration: --disable-yasm --enable-shared --enable-libopenh264 --cc='gcc -fPIC'
libavutil 55. 58.100 / 55. 58.100
libavcodec 57. 89.100 / 57. 89.100
libavformat 57. 71.100 / 57. 71.100
libavdevice 57. 6.100 / 57. 6.100
libavfilter 6. 82.100 / 6. 82.100
libswscale 4. 6.100 / 4. 6.100
libswresample 2. 7.100 / 2. 7.100



I tried to get more information of the error using gbd, but it didn't give me debugging info.



How can I solve this problem ? I don't know what else can I try...



Thank you !


-
ffmpeg version 2.6.8 : Stream specifier ':a' in filtergraph description matches no streams
16 décembre 2020, par AshitakaI am not getting why this isn't working.. I have tried to get the video streams with [0:v]/[0:1]/[0:v:0] & the audio streams with [0:a]/[0:0]/[0:0:0].
nothing worked.


Explaining the inputs :


1.1st input stream is a video that can be of varying resolution on which the filter adds a padding on to make it 600:480.


2.2nd input is an overlay png which is already at 5:4 ratio.. just making it 600:480 before it gets overlaid in the filter.


3.3rd & 4th ones are also videos which I don't care if they get stretched.. n they are getting stretched to 600:480.


4.so finally there are 3 streams 1 overlaid video 2 stretched videos which needs to be concatenated.


here's the command :


ffmpeg 
-i '/home/vidinflux/public_html/assets/temp/2018020116464612/2018020116464612.mp4' 
-i '/home/vidinflux/public_html/assets/temp/2018020116464612/2018020116464612_overlay.png' 
-i '/home/vidinflux/public_html/assets/user/736/video/Lines1.mp4' 
-i '/home/vidinflux/public_html/assets/user/736/video/Lines11.mp4' 
-filter_complex
"[0:v]trim=0:138,setpts=PTS-STARTPTS[v0];[0:a]atrim=0:138,asetpts=PTS-STARTPTS[a0];[v0]scale='gte(iw/ih\,600/480)*600+lt(iw/ih\,600/480)*((480*iw)/ih):lte(iw/ih\,600/480)*480+gt(iw/ih\,600/480)*((600*ih)/iw)',pad='600:480:(600-gte(iw/ih\,600/480)*600-lt(iw/ih\,600/480)*((480*iw)/ih))/2:(480-lte(iw/ih\,600/480)*480-gt(iw/ih\,600/480)*((600*ih)/iw))/2:black'[x];[1:v]scale=600:480[y];[x][y]overlay=0:0[z];[2:v]scale=600:480,setsar=1:1[x0];[3:v]scale=600:480,setsar=1:1[x1];[x0][2:a][z][a0][x1][3:a]concat=n=3:v=1:a=1[v][a]" 
-map "[v]" 
-map "[a]" 
-c:v libx264 
-shortest /home/vidinflux/public_html/assets/temp/2018020116464612/2018020116464612_final.mp4


this is the complete error I am getting :


Stream specifier ':a' in filtergraph description [0:v]trim=0:138,setpts=PTS-STARTPTS[v0];[0:a]atrim=0:138,asetpts=PTS-STARTPTS[a0];[v0]scale='gte(iw/ih\,600/480)*600+lt(iw/ih\,600/480)*((480*iw)/ih):lte(iw/ih\,600/480)*480+gt(iw/ih\,600/480)*((600*ih)/iw)',pad='600:480:(600-gte(iw/ih\,600/480)*600-lt(iw/ih\,600/480)*((480*iw)/ih))/2:(480-lte(iw/ih\,600/480)*480-gt(iw/ih\,600/480)*((600*ih)/iw))/2:black'[x];[1:v]scale=600:480[y];[x][y]overlay=0:0[z];[2:v]scale=600:480,setsar=1:1[x0];[3:v]scale=600:480,setsar=1:1[x1];[x0][2:a][z][a0][x1][3:a]concat=n=3:v=1:a=1[v][a] matches no streams.


also there are these warnings :


[Parsed_setsar_9 @ 0x219fba0] num:den syntax is deprecated, please use num/den or named options instead
[Parsed_setsar_11 @ 0x21a4840] num:den syntax is deprecated, please use num/den or named options instead


Complete log as requested :


[root@cloud ~]# ffmpeg -i '/home/vidinflux/public_html/assets/temp/2018020116464612/2018020116464612.mp4' -i '/home/vidinflux/public_html/assets/temp/2018020116464612/2018020116464612_overlay.png' -i '/home/vidinflux/public_html/assets/user/736/video/Lines1.mp4' -i '/home/vidinflux/public_html/assets/user/736/video/Lines11.mp4' -filter_complex \ "[0:v]trim=0:138,setpts=PTS-STARTPTS[v0];[0:a]atrim=0:138,asetpts=PTS-STARTPTS[a0];[v0]scale='gte(iw/ih\,600/480)*600+lt(iw/ih\,600/480)*((480*iw)/ih):lte(iw/ih\,600/480)*480+gt(iw/ih\,600/480)*((600*ih)/iw)',pad='600:480:(600-gte(iw/ih\,600/480)*600-lt(iw/ih\,600/480)*((480*iw)/ih))/2:(480-lte(iw/ih\,600/480)*480-gt(iw/ih\,600/480)*((600*ih)/iw))/2:black'[x];[1:v]scale=600:480[y];[x][y]overlay=0:0[z];[2:v]scale=600:480,setsar=1:1[x0];[3:v]scale=600:480,setsar=1:1[x1];[x0][2:a][z][a0][x1][3:a]concat=n=3:v=1:a=1[v][a]" -map "[v]" -map "[a]" -c:v libx264 -shortest /home/vidinflux/public_html/assets/temp/2018020116464612/2018020116464612_final.mp4
ffmpeg version 2.6.8 Copyright (c) 2000-2016 the FFmpeg developers
 built with gcc 4.4.7 (GCC) 20120313 (Red Hat 4.4.7-16)
 configuration: --prefix=/usr --bindir=/usr/bin --datadir=/usr/share/ffmpeg --incdir=/usr/include/ffmpeg --libdir=/usr/lib64 --mandir=/usr/share/man --arch=x86_64 --optflags='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic' --enable-bzlib --disable-crystalhd --enable-gnutls --enable-ladspa --enable-libass --enable-libdc1394 --enable-libfaac --enable-nonfree --disable-indev=jack --enable-libfreetype --enable-libgsm --enable-libmp3lame --enable-openal --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libvorbis --enable-libv4l2 --enable-libx264 --enable-libx265 --enable-libxvid --enable-x11grab --enable-avfilter --enable-avresample --enable-postproc --enable-pthreads --disable-static --enable-shared --enable-gpl --disable-debug --disable-stripping --shlibdir=/usr/lib64 --enable-runtime-cpudetect
 libavutil 54. 20.100 / 54. 20.100
 libavcodec 56. 26.100 / 56. 26.100
 libavformat 56. 25.101 / 56. 25.101
 libavdevice 56. 4.100 / 56. 4.100
 libavfilter 5. 11.102 / 5. 11.102
 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, mov,mp4,m4a,3gp,3g2,mj2, from '/home/vidinflux/public_html/assets/temp/2018020116464612/2018020116464612.mp4':
 Metadata:
 major_brand : mp42
 minor_version : 0
 compatible_brands: isommp42
 creation_time : 2017-08-21 02:23:24
 Duration: 00:02:17.23, start: 0.000000, bitrate: 417 kb/s
 Stream #0:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p(tv, bt709), 640x360 [SAR 1:1 DAR 16:9], 318 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
 Metadata:
 handler_name : VideoHandler
 Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 96 kb/s (default)
 Metadata:
 creation_time : 2017-08-21 02:23:24
 handler_name : IsoMedia File Produced by Google, 5-11-2011
Input #1, png_pipe, from '/home/vidinflux/public_html/assets/temp/2018020116464612/2018020116464612_overlay.png':
 Duration: N/A, bitrate: N/A
 Stream #1:0: Video: png, rgba, 600x479, 25 tbr, 25 tbn, 25 tbc
Input #2, mov,mp4,m4a,3gp,3g2,mj2, from '/home/vidinflux/public_html/assets/user/736/video/Lines1.mp4':
 Metadata:
 major_brand : mp42
 minor_version : 1
 compatible_brands: mp41mp42isom
 creation_time : 2018-01-31 22:40:09
 Duration: 00:00:04.90, start: 0.103811, bitrate: 846 kb/s
 Stream #2:0(und): Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p(tv, smpte170m/bt470bg/bt709), 1920x1080, 827 kb/s, SAR 1:1 DAR 16:9, 30 fps, 30 tbr, 90k tbn, 180k tbc (default)
 Metadata:
 creation_time : 2018-01-31 22:40:10
 handler_name : Core Media Video
Input #3, mov,mp4,m4a,3gp,3g2,mj2, from '/home/vidinflux/public_html/assets/user/736/video/Lines11.mp4':
 Metadata:
 major_brand : mp42
 minor_version : 1
 compatible_brands: mp41mp42isom
 creation_time : 2018-01-31 22:40:09
 Duration: 00:00:04.90, start: 0.103811, bitrate: 846 kb/s
 Stream #3:0(und): Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p(tv, smpte170m/bt470bg/bt709), 1920x1080, 827 kb/s, SAR 1:1 DAR 16:9, 30 fps, 30 tbr, 90k tbn, 180k tbc (default)
 Metadata:
 creation_time : 2018-01-31 22:40:10
 handler_name : Core Media Video
[Parsed_setsar_9 @ 0x17c8ba0] num:den syntax is deprecated, please use num/den or named options instead
[Parsed_setsar_11 @ 0x17cd840] num:den syntax is deprecated, please use num/den or named options instead
Stream specifier ':a' in filtergraph description [0:v]trim=0:138,setpts=PTS-STARTPTS[v0];[0:a]atrim=0:138,asetpts=PTS-STARTPTS[a0];[v0]scale='gte(iw/ih\,600/480)*600+lt(iw/ih\,600/480)*((480*iw)/ih):lte(iw/ih\,600/480)*480+gt(iw/ih\,600/480)*((600*ih)/iw)',pad='600:480:(600-gte(iw/ih\,600/480)*600-lt(iw/ih\,600/480)*((480*iw)/ih))/2:(480-lte(iw/ih\,600/480)*480-gt(iw/ih\,600/480)*((600*ih)/iw))/2:black'[x];[1:v]scale=600:480[y];[x][y]overlay=0:0[z];[2:v]scale=600:480,setsar=1:1[x0];[3:v]scale=600:480,setsar=1:1[x1];[x0][2:a][z][a0][x1][3:a]concat=n=3:v=1:a=1[v][a] matches no streams.


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