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Autres articles (52)
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Websites made with MediaSPIP
2 mai 2011, parThis page lists some websites based on MediaSPIP.
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Possibilité de déploiement en ferme
12 avril 2011, parMediaSPIP peut être installé comme une ferme, avec un seul "noyau" hébergé sur un serveur dédié et utilisé par une multitude de sites différents.
Cela permet, par exemple : de pouvoir partager les frais de mise en œuvre entre plusieurs projets / individus ; de pouvoir déployer rapidement une multitude de sites uniques ; d’éviter d’avoir à mettre l’ensemble des créations dans un fourre-tout numérique comme c’est le cas pour les grandes plate-formes tout public disséminées sur le (...) -
Ajouter des informations spécifiques aux utilisateurs et autres modifications de comportement liées aux auteurs
12 avril 2011, parLa manière la plus simple d’ajouter des informations aux auteurs est d’installer le plugin Inscription3. Il permet également de modifier certains comportements liés aux utilisateurs (référez-vous à sa documentation pour plus d’informations).
Il est également possible d’ajouter des champs aux auteurs en installant les plugins champs extras 2 et Interface pour champs extras.
Sur d’autres sites (7497)
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How to convert from .srt to .ass with FFmpeg without decoding errors
10 avril 2020, par symonxdWhen I try the following command with FFmpeg (v. git-2020-03-24-e5d25d1) :
ffmpeg -i subs.srt subs.ass
, I get a bunch of the following errors :


[srt @ 0000028ea78fa780] Invalid UTF-8 in decoded subtitles text; maybe missing -sub_charenc option
Error while decoding stream #0:0: Invalid data found when processing input




and :



[ass @ 0000028ea78ffe40] ReadOrder gap found between 3 and 4




I found that my .srt file contains the following char : ë
I tried adding the flag
-sub_charenc UTF-8
as stated here with no success.


How can I successfully convert .srt to .ass ?


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How to use ffmpeg to overlay waveforms on xstack mosaics and specify specific audio for playback
1er mai 2022, par kellibI would like to make a mosaic of multiple titled streams, 1) specifying which of the audio streams to play and 2) overlay waveforms at the bottom of each of the video tiles for the audio that they belong to.


I'm successfully able to create the titled mosaic of streams with the code below.


However :


- 

- I'm having a hard time figuring out how to specify just one of the specific audio sources. I found amix, but I don't really want to mix them, I just want to specify audio [a0], or [a1], or [a2], etc.




and


- 

- I'm having a hard time figuring out how to overlay the wave forms at the bottom of the video for each of the tiles. I struggled trying to figure out putting showwaves into the mix. Is it possible ?




I want each tile to look like this, but since these are rtmp streams, they need to play-out the matching waveforms dynamically with each stream. https://dragonquest64.blogspot.com/2020/01/ffmpeg-audio-waveform.html


If someone could point me in the right direction, that would be great. I'm getting close, but I'm pretty new to all of this, and have already spent way more time than I should have, so would love a little help.


ffmpeg \
-i rtmp://my.cdn.com/srcEncoders/STREAM-1 \
-i rtmp://my.cdn.com/srcEncoders/STREAM-2 \
-i rtmp://my.cdn.com/srcEncoders/STREAM-3 \
-i rtmp://my.cdn.com/srcEncoders/STREAM-4 \
 -filter_complex " \
 [0:v] setpts=PTS-STARTPTS, scale=qvga \
 , drawtext=text=STREAM-1:fontsize=20:x=10:y=10:fontcolor=white:box=1:boxcolor=black@0.5:boxborderw=5 [a0]; \
 [1:v] setpts=PTS-STARTPTS, scale=qvga \
 , drawtext=text=STREAM-2:fontsize=20:x=10:y=10:fontcolor=white:box=1:boxcolor=black@0.5:boxborderw=5 [a1]; \
 [2:v] setpts=PTS-STARTPTS, scale=qvga \
 , drawtext=text=STREAM-3:fontsize=20:x=10:y=10:fontcolor=white:box=1:boxcolor=black@0.5:boxborderw=5 [a2]; \
 [3:v] setpts=PTS-STARTPTS, scale=qvga \ 
 , drawtext=text=STREAM-4:fontsize=20:x=10:y=10:fontcolor=white:box=1:boxcolor=black@0.5:boxborderw=5 [a3]; \
 [a0][a1][a2][a3]xstack=inputs=4:layout=0_0|0_h0|w0_0|w0_h0[out]; \
 amix=inputs=1
 " \
 -map "[out]" \
 -c:v libx264 -b:v 1000k -g 30 -keyint_min 120 -profile:v baseline -preset veryfast -f mpegts "udp://127.0.0.1:1234?pkt_size=1316"



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ffmpeg doesn't detect the subtitle format (webvtt) and refuses to copy it
29 novembre 2023, par ThomasI am trying to re-encode the audio on some video files.
I want to copy the video and subtitles without touching them, however, ffmpeg doesn't detect the format of the subtitle (which is webvtt) and refuses to do anything.



fmpeg -copy_unknown -analyzeduration 2000M -probesize 2000M -i input.mkv -map_metadata 0 -map 0 -c copy -c:a:0 aac -b:a 384k output.mkv



[matroska,webm @ 0x5597558e4040] Unknown/unsupported AVCodecID S_TEXT/WEBVTT.
[matroska,webm @ 0x5597558e4040] Could not find codec parameters for stream 2 (Subtitle: none): unknown codec
Consider increasing the value for the 'analyzeduration' and 'probesize' options
Guessed Channel Layout for Input Stream #0.1 : 5.1
Input #0, matroska,webm, from 'input.mkv':
 Metadata:
 encoder : libebml v1.3.9 + libmatroska v1.5.2
 creation_time : 2020-03-05T09:03:02.000000Z
 Duration: 00:56:33.26, start: 0.000000, bitrate: 3597 kb/s
 Stream #0:0: Video: h264 (High), yuv420p(progressive), 1920x1080 [SAR 1:1 DAR 16:9], 23.98 fps, 23.98 tbr, 1k tbn, 47.95 tbc (default)
 Metadata:
 BPS-eng : 3340067
 DURATION-eng : 00:56:33.140000000
 NUMBER_OF_FRAMES-eng: 81354
 NUMBER_OF_BYTES-eng: 1416664616
 _STATISTICS_WRITING_APP-eng: mkvmerge v38.0.0 ('The Silent Type') 64-bit
 _STATISTICS_WRITING_DATE_UTC-eng: 2020-03-05 09:03:02
 _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
 Stream #0:1: Audio: eac3, 48000 Hz, 5.1, fltp (default)
 Metadata:
 BPS-eng : 256000
 DURATION-eng : 00:56:33.248000000
 NUMBER_OF_FRAMES-eng: 106039
 NUMBER_OF_BYTES-eng: 108583936
 _STATISTICS_WRITING_APP-eng: mkvmerge v38.0.0 ('The Silent Type') 64-bit
 _STATISTICS_WRITING_DATE_UTC-eng: 2020-03-05 09:03:02
 _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
 Stream #0:2(eng): Subtitle: none (default)
 Metadata:
 BPS-eng : 38
 DURATION-eng : 00:54:47.388000000
 NUMBER_OF_FRAMES-eng: 514
 NUMBER_OF_BYTES-eng: 15766
 _STATISTICS_WRITING_APP-eng: mkvmerge v38.0.0 ('The Silent Type') 64-bit
 _STATISTICS_WRITING_DATE_UTC-eng: 2020-03-05 09:03:02
 _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES

Stream mapping:
 Stream #0:0 -> #0:0 (copy)
 Stream #0:1 -> #0:1 (eac3 (native) -> aac (native))
 Stream #0:2 -> #0:2 (copy)

[aac @ 0x5597b06ae000] Using a PCE to encode channel layout "5.1(side)"
[matroska @ 0x5597b06ab540] Subtitle codec 0 is not supported.
Could not write header for output file #0 (incorrect codec parameters ?): Function not implemented
Error initializing output stream 0:1 -- 
[aac @ 0x5597b06ae000] Qavg: -nan
Conversion failed!




VLC shows it as WebVTT and displays the subtitles correctly :






MediaInfo also detects properly as webvtt :



Text
ID : 3
Format : S_TEXT/WEBVTT
Codec ID : S_TEXT/WEBVTT
Duration : 54 min 47 s
Bit rate : 38 b/s
Count of elements : 514
Stream size : 15.4 KiB (0%)
Language : English
Default : Yes
Forced : No




My ffmpeg was built with webvtt :



$ ffmpeg -codecs | grep VTT
ffmpeg version n4.2.2 Copyright (c) 2000-2019 the FFmpeg developers
 built with gcc 9.3.0 (Arch Linux 9.3.0-1)
 configuration: --prefix=/usr --disable-debug --disable-static --disable-stripping --enable-fontconfig --enable-gmp --enable-gnutls --enable-gpl --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libdav1d --enable-libdrm --enable-libfreetype --enable-libfribidi --enable-libgsm --enable-libiec61883 --enable-libjack --enable-libmfx --enable-libmodplug --enable-libmp3lame --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libv4l2 --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxcb --enable-libxml2 --enable-libxvid --enable-nvdec --enable-nvenc --enable-omx --enable-shared --enable-version3
 libavutil 56. 31.100 / 56. 31.100
 libavcodec 58. 54.100 / 58. 54.100
 libavformat 58. 29.100 / 58. 29.100
 libavdevice 58. 8.100 / 58. 8.100
 libavfilter 7. 57.100 / 7. 57.100
 libswscale 5. 5.100 / 5. 5.100
 libswresample 3. 5.100 / 3. 5.100
 libpostproc 55. 5.100 / 55. 5.100
 DES... webvtt WebVTT subtitle




How can I tell ffmpeg "this is webvtt, just copy it please !" ?



EDIT : RESOLVED (thanks @Gyan)



To force the decoder,
-c:s webvtt
must be set before the input :
fmpeg -analyzeduration 50M -probesize 50M -c:s webvtt -i input.mkv ...