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Video d’abeille en portrait
14 mai 2011, par
Mis à jour : Février 2012
Langue : français
Type : Video
Autres articles (90)
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Taille des images et des logos définissables
9 février 2011, parDans beaucoup d’endroits du site, logos et images sont redimensionnées pour correspondre aux emplacements définis par les thèmes. L’ensemble des ces tailles pouvant changer d’un thème à un autre peuvent être définies directement dans le thème et éviter ainsi à l’utilisateur de devoir les configurer manuellement après avoir changé l’apparence de son site.
Ces tailles d’images sont également disponibles dans la configuration spécifique de MediaSPIP Core. La taille maximale du logo du site en pixels, on permet (...) -
Participer à sa traduction
10 avril 2011Vous pouvez nous aider à améliorer les locutions utilisées dans le logiciel ou à traduire celui-ci dans n’importe qu’elle nouvelle langue permettant sa diffusion à de nouvelles communautés linguistiques.
Pour ce faire, on utilise l’interface de traduction de SPIP où l’ensemble des modules de langue de MediaSPIP sont à disposition. ll vous suffit de vous inscrire sur la liste de discussion des traducteurs pour demander plus d’informations.
Actuellement MediaSPIP n’est disponible qu’en français et (...) -
Supporting all media types
13 avril 2011, parUnlike most software and media-sharing platforms, MediaSPIP aims to manage as many different media types as possible. The following are just a few examples from an ever-expanding list of supported formats : images : png, gif, jpg, bmp and more audio : MP3, Ogg, Wav and more video : AVI, MP4, OGV, mpg, mov, wmv and more text, code and other data : OpenOffice, Microsoft Office (Word, PowerPoint, Excel), web (html, CSS), LaTeX, Google Earth and (...)
Sur d’autres sites (11438)
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How to remove black bars with ffmpeg ?
3 novembre 2022, par watch-thisI'm trying to remove black bars from a 637×478 video




here's what happens :


% ffmpeg -i sfu11.mp4 -vf "scale=ih*16/9:ih,scale=iw:-2,setsar=1" -y out.mp4 
ffmpeg version 5.1.2 Copyright (c) 2000-2022 the FFmpeg developers
 built with Apple clang version 14.0.0 (clang-1400.0.29.102)
 configuration: --prefix=/usr/local/Cellar/ffmpeg/5.1.2 --enable-shared --enable-pthreads --enable-version3 --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libdav1d --enable-libmp3lame --enable-libopus --enable-librav1e --enable-librist --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libspeex --enable-libsoxr --enable-libzmq --enable-libzimg --disable-libjack --disable-indev=jack --enable-videotoolbox
 libavutil 57. 28.100 / 57. 28.100
 libavcodec 59. 37.100 / 59. 37.100
 libavformat 59. 27.100 / 59. 27.100
 libavdevice 59. 7.100 / 59. 7.100
 libavfilter 8. 44.100 / 8. 44.100
 libswscale 6. 7.100 / 6. 7.100
 libswresample 4. 7.100 / 4. 7.100
 libpostproc 56. 6.100 / 56. 6.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'sfu11.mp4':
 Metadata:
 major_brand : isom
 minor_version : 512
 compatible_brands: isomiso2mp41
 encoder : Lavf57.83.100
 Duration: 01:02:49.37, start: 0.000000, bitrate: 15 kb/s
 Chapters:
 Chapter #0:0: start 0.000000, end 99.833000
 Metadata:
 title : Chapter 01
 Chapter #0:1: start 99.833000, end 701.818000
 Metadata:
 title : Chapter 02
 Chapter #0:2: start 701.818000, end 1213.746000
 Metadata:
 title : Chapter 03
 Chapter #0:3: start 1213.746000, end 1726.892000
 Metadata:
 title : Chapter 04
 Chapter #0:4: start 1726.892000, end 2167.882000
 Metadata:
 title : Chapter 05
 Chapter #0:5: start 2167.882000, end 2816.430000
 Metadata:
 title : Chapter 06
 Chapter #0:6: start 2816.430000, end 3769.366000
 Metadata:
 title : Chapter 07
 Stream #0:0[0x1](und): Video: hevc (Main 10) (hvc1 / 0x31637668), yuv420p10le(tv, progressive), 708x478 [SAR 9:10 DAR 1593:1195], 544 kb/s, 23.98 fps, 23.98 tbr, 24k tbn (default)
 Metadata:
 handler_name : VideoHandler
 vendor_id : [0][0][0][0]
 Stream #0:1[0x2](eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, 5.1, fltp, 341 kb/s (default)
 Metadata:
 handler_name : SoundHandler
 vendor_id : [0][0][0][0]
 Stream #0:2[0x3](eng): Data: bin_data (text / 0x74786574)
 Metadata:
 handler_name : SubtitleHandler
Stream mapping:
 Stream #0:0 -> #0:0 (hevc (native) -> h264 (libx264))
 Stream #0:1 -> #0:1 (aac (native) -> aac (native))
Press [q] to stop, [?] for help
[libx264 @ 0x7f8630806e00] width not divisible by 2 (849x478)
Error initializing output stream 0:0 -- Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height
[aac @ 0x7f8630809d00] Qavg: 15927.165
[aac @ 0x7f8630809d00] 2 frames left in the queue on closing
Conversion failed!


However, the same flags work using
ffplaybut I get horizontal black bars instead.

% ffplay -i sfu11.mp4 -vf "scale=ih\*16/9:ih,scale=iw:-2,setsar=1"




I also tried using the cropdetect filter. It doesn't work and end up with the very same black bars while passing
-vf crop=....

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How do I get an InputStream out of a Mono ?
30 octobre 2022, par EinfariBear with my noobness, I am learning web-flux. I had this simple application that takes a video and extract the audio using FFprobe and FFmpeg, so I thought of redoing it reactively, but I am failing miserably...


Controller :


@PostMapping("/upload")
public String upload(@RequestPart("file") Mono<filepart> filePartMono, final Model model) {
 Flux<string> filenameList = mediaComponent.extractAudio(filePartMono);
 model.addAttribute("filenameList", new ReactiveDataDriverContextVariable(filenameList));
 return "download";
}
</string></filepart>

Function to get audio streams out of the video :


public Mono<ffproberesult> getAudioStreams(InputStream inputStream) {
 try {
 return Mono.just(FFprobe.atPath(FFprobePath)
 .setShowStreams(true)
 .setSelectStreams(StreamType.AUDIO)
 .setLogLevel(LogLevel.INFO)
 .setInput(inputStream)
 .execute());
 } catch (JaffreeException e) {
 log.error(e.getMessage(), e);
 throw new MediaException("Audio formats could not be identified.");
 }
}
</ffproberesult>

Attempt 1 :


public Flux<string> extractAudio(Mono<filepart> filePartMono) {
 filePartMono.flatMapMany(Part::content)
 .map(dataBuffer -> dataBuffer.asInputStream(true))
 .flatMap(this::getAudioStreams)
 .subscribe(System.out::println);
 ...
}
</filepart></string>

Attempt 2 :


public Flux<string> extractAudio(Mono<filepart> filePartMono) {
 filePartMono.flatMapMany(Part::content)
 .reduce(InputStream.nullInputStream(), (inputStream, dataBuffer) -> new SequenceInputStream(
 inputStream, dataBuffer.asInputStream()
 ))
 .flatMap(this::getAudioStreams)
 .subscribe(System.out::println);
 ...
}
</filepart></string>

Attempt 3 :


public Flux<string> extractAudio(Mono<filepart> filePartMono) {
 DataBufferUtils.write(filePartMono.flatMapMany(Part::content), OutputStream.nullOutputStream())
 .map(dataBuffer -> dataBuffer.asInputStream(true))
 .flatMap(this::getAudioStreams)
 .subscribe(System.out::println);
 ...
}
</filepart></string>

Attempt 1 and 3 seems to be the same in the end, FFprobe complains as follows :


2022-10-30 11:24:30.292 WARN 79049 --- [ StdErr] c.g.k.jaffree.process.BaseStdReader : [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7f9162702340] [warning] STSZ atom truncated
2022-10-30 11:24:30.292 ERROR 79049 --- [ StdErr] c.g.k.jaffree.process.BaseStdReader : [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7f9162702340] [error] stream 0, contradictionary STSC and STCO
2022-10-30 11:24:30.292 ERROR 79049 --- [ StdErr] c.g.k.jaffree.process.BaseStdReader : [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7f9162702340] [error] error reading header
2022-10-30 11:24:30.294 ERROR 79049 --- [ StdErr] c.g.k.jaffree.process.BaseStdReader : [error] tcp://127.0.0.1:51532: Invalid data found when processing input
2022-10-30 11:24:30.295 INFO 79049 --- [oundedElastic-3] c.g.k.jaffree.process.ProcessHandler : Process has finished with status: 1
2022-10-30 11:24:30.409 ERROR 79049 --- [oundedElastic-3] c.e.s.application.MediaComponent : Process execution has ended with non-zero status: 1. Check logs for detailed error message.


Attempt 2 produces multiple of these :


Exception in thread "Runnable-0" java.lang.StackOverflowError
 at java.base/java.io.SequenceInputStream.read(SequenceInputStream.java:198)


Could anybody point me in the right direction ? What am I doing wrong ? By the way, I am outputting to console just to see a result, but in the end I need to take all the outputted streams and pass them as arguments to another function that will finally extract the audio, so I need to figure out that as well.


Thank you in advance.


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Can't get CBR when converting MP4 to Mono MP3
28 octobre 2022, par GDPHaving read at least a dozen other answers, it seems that the
b:a 96kparameter should be producing a MP3 with a constant bitrate (CBR), yet I can only get Variable bitrates.

The latest variation of ffmpeg that comes closest is below. I don't believe I'm missing anything, so are the other values interfering ?


UPDATE : replace input/output with the latest results.


From MediaInfo :


General
Complete name : C:\3024.mp3
Format : MPEG Audio
File size : 124 MiB
Duration : 2 h 59 min
Overall bit rate mode : Variable
Overall bit rate : 96.0 kb/s
Track name : My Title
Writing library : LAME3.100
major_brand : mp42
minor_version : 0
compatible_brands : mp42mp41

Audio
Format : MPEG Audio
Format version : Version 1
Format profile : Layer 3
Duration : 2 h 59 min
Bit rate mode : Variable
Bit rate : 96.0 kb/s
Channel(s) : 1 channel
Sampling rate : 44.1 kHz
Frame rate : 38.281 FPS (1152 SPF)
Compression mode : Lossy
Stream size : 124 MiB (100%)
Writing library : LAME3.100


ffmpeg -i 3024.mp4 -metadata title="My Title" -vn -ar 44100 -ac 1 -b:a 96k 3024.mp3

ffmpeg version 4.1.1 Copyright (c) 2000-2019 the FFmpeg developers
 built with gcc 8.2.1 (GCC) 20190212
 configuration: --enable-gpl --enable-version3 --enable-sdl2 --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-libxvid --enable-libaom --enable-libmfx --enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth
 libavutil 56. 22.100 / 56. 22.100
 libavcodec 58. 35.100 / 58. 35.100
 libavformat 58. 20.100 / 58. 20.100
 libavdevice 58. 5.100 / 58. 5.100
 libavfilter 7. 40.101 / 7. 40.101
 libswscale 5. 3.100 / 5. 3.100
 libswresample 3. 3.100 / 3. 3.100
 libpostproc 55. 3.100 / 55. 3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '20221011_regular_3024.mp4':
 Metadata:
 major_brand : mp42
 minor_version : 0
 compatible_brands: mp42mp41
 creation_time : 2022-10-12T06:53:10.000000Z
 Duration: 02:59:59.36, start: 0.000000, bitrate: 1297 kb/s
 Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 1280x720 [SAR 1:1 DAR 16:9], 1198 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 60k tbc (default)
 Metadata:
 creation_time : 2022-10-12T06:53:10.000000Z
 handler_name : ?Mainconcept Video Media Handler
 encoder : AVC Coding
 Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 93 kb/s (default)
 Metadata:
 creation_time : 2022-10-12T06:53:11.000000Z
 handler_name : #Mainconcept MP4 Sound Media Handler
Stream mapping:
 Stream #0:1 -> #0:0 (aac (native) -> mp3 (libmp3lame))
Press [q] to stop, [?] for help
Output #0, mp3, to '20221011_regular_3024.mp3':
 Metadata:
 major_brand : mp42
 minor_version : 0
 compatible_brands: mp42mp41
 TIT2 : Regular Meeting on Tuesday, October 11th, 2022
 TSSE : Lavf58.20.100
 Stream #0:0(eng): Audio: mp3 (libmp3lame), 44100 Hz, mono, fltp, 96 kb/s (default)
 Metadata:
 creation_time : 2022-10-12T06:53:11.000000Z
 handler_name : #Mainconcept MP4 Sound Media Handler
 encoder : Lavc58.35.100 libmp3lame
size= 126556kB time=02:59:59.36 bitrate= 96.0kbits/s speed= 126x
video:0kB audio:126555kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.000393% ```


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