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Richard Stallman et le logiciel libre
19 octobre 2011, par
Mis à jour : Mai 2013
Langue : français
Type : Texte
Autres articles (64)
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Keeping control of your media in your hands
13 avril 2011, parThe vocabulary used on this site and around MediaSPIP in general, aims to avoid reference to Web 2.0 and the companies that profit from media-sharing.
While using MediaSPIP, you are invited to avoid using words like "Brand", "Cloud" and "Market".
MediaSPIP is designed to facilitate the sharing of creative media online, while allowing authors to retain complete control of their work.
MediaSPIP aims to be accessible to as many people as possible and development is based on expanding the (...) -
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 (...) -
Websites made with MediaSPIP
2 mai 2011, parThis page lists some websites based on MediaSPIP.
Sur d’autres sites (12009)
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How to initialize the AV format context from NetworkStream rather than url ?
23 juillet 2020, par AhmadI'm using FFmpeg.AutoGen to encode catpured frames :
https://github.com/Ruslan-B/FFmpeg.AutoGen


I send the encoded packets through NetworkStream to another program using TCP Client/Server application, using this code :


//Send size and encoded packet
 _stream.Write(BitConverter.GetBytes(pPacket->size), 0, 4);
 using (var packetStream = new UnmanagedMemoryStream(pPacket->data, pPacket->size)) 
 packetStream.CopyTo(_stream);


At the server-side, after UTF8 encoding, I receive content like this :




gd ?r@ ?/ ?a 21 ?
h?C?,? ????E???H??,? ?#??x264 - core 160 - H.264/MPEG-4 AVC codec - Copyleft 2003-2020 - http://www.videolan.org/x264.html - options: cabac=1 ref=16 deblock=1:0:0 analyse=0x3:0x133 me=umh subme=10 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=24 chroma_me=1 trellis=2 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=11 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=8 b_pyramid=2 b_adapt=2 b_bias=0 direct=3 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=60 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00 ? e?? ??S?T????M?.O ??Ea???Q?OI??X?????[?P???42=h??M?K? ??{?@c;?t???Ke?>?????2 ?? ?\qXEvg ???U A ?X ??q/(?? ?L ?_c ?g ?X ?c(To ?k ?Y ?-F ???R ?] ??U ?
 ;|=r ????\U ???2 ?g ??> ??½ ?7 ?A ?1W9 ???A ?? ?_L ??P ?) ?M ????q/ ?L ??) : ??< ??8d/* ? ?^ ??} ?B ?H ?_8C[y ???CY ?QM(J ???1<3% ?K ?F ;Q3Q ????
 ??jyJ" ???y]k ?m ?^} ???S ????h ?3 ????EP ???pw ???q ?jKp ???h ?????



My problem is, how to initialize the AV format context with this data, and decode the received packet to recover the original frame ?


_pFormatContext = ffmpeg.avformat_alloc_context();
ffmpeg.avformat_open_input(&pFormatContext, url, null, null).ThrowExceptionIfError();


As problem exactly is, ffmpeg.avformat_open_input takes URL as an input, not byte[]. If _pFormatContext can be initialized using the received data, things are resolved, but HOW ?


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ffmpeg segmentation filter don't works with strftime filename template
24 juillet 2020, par Ksnadr RenderonI try to run ffmpeg with segment filter and timestamp filename template :


ffmpeg -f v4l2 -framerate 30 -video_size 960x720 -i /dev/video0 -f segment -segment_time 5 -reset_timestamps 1 -segment_format mp4 -strftime 1 out%Y-%m-%d_%H-%M-%S.mp4


and i got error :


Invalid segment filename template 'out%Y-%m-%d_%H-%M-%S.mp4'


I have read a lot of posts and questions in the internet with the same arguments (after input, which is specific) and people says that this works. What wrong with my command ?


UPD : add full ffmpeg log


root@nanopiair:~# ffmpeg -f v4l2 -framerate 30 -video_size 960x720 -i /dev/video0 -f segment -segment_time 5 -reset_timestamps 1 -segment_format mp4 -strftime 1 out%Y-%m-%d_%H-%M-%S.mp4
ffmpeg version git-2015-01-22-f86a076 Copyright (c) 2000-2014 the FFmpeg developers
 built on Jul 22 2020 12:02:39 with gcc 8 (Debian 8.3.0-6)
 configuration: --prefix=/usr --enable-nonfree --enable-gpl --enable-vdpau --enable-libx264 --enable-libv4l2 --enable-libfreetype --enable-libfontconfig --enable-libfribidi
 libavutil 54. 6.100 / 54. 6.100
 libavcodec 56. 0.101 / 56. 0.101
 libavformat 56. 2.100 / 56. 2.100
 libavdevice 56. 0.100 / 56. 0.100
 libavfilter 5. 0.102 / 5. 0.102
 libswscale 3. 0.100 / 3. 0.100
 libswresample 1. 1.100 / 1. 1.100
 libpostproc 53. 0.100 / 53. 0.100
Input #0, video4linux2,v4l2, from '/dev/video0':
 Duration: N/A, start: 2548.007454, bitrate: 248832 kb/s
 Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 960x720, 248832 kb/s, 30 fps, 30 tbr, 1000k tbn, 1000k tbc
[libx264 @ 0x201bec0] using cpu capabilities: ARMv6 NEON
[libx264 @ 0x201bec0] profile High, level 3.1
[libx264 @ 0x201bec0] 264 - core 142 - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 - 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=6 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=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
[mp4 @ 0x2507bd0] Invalid segment filename template 'out%Y-%m-%d_%H-%M-%S.mp4'
Output #0, segment, to 'out%Y-%m-%d_%H-%M-%S.mp4':
 Metadata:
 encoder : Lavf56.2.100
 Stream #0:0: Video: h264 (libx264), yuv420p, 960x720, q=-1--1, 30 fps, 30 tbn, 30 tbc
 Metadata:
 encoder : Lavc56.0.101 libx264
Stream mapping:
 Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (libx264))
Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument


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ffmpeg : Extract unknown data stream from video container
23 juillet 2020, par PikkostackI have a .MOV container which contains the following tracks :


Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 3840x2160 [SAR 1:1 DAR 16:9], 100619 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc (default)
Metadata:
 creation_time : 2020-07-21T22:48:24.000000Z
 handler_name : DJI.AVC
 encoder : AVC encoder
Stream #0:1(eng): Data: none (priv / 0x76697270), 87 kb/s
Metadata:
 creation_time : 2020-07-21T22:48:24.000000Z
 handler_name : DJI.Meta
Stream #0:2(eng): Subtitle: mov_text (text / 0x74786574), 2 kb/s (default)
Metadata:
 creation_time : 2020-07-21T22:48:24.000000Z
 handler_name : DJI.Subtitle


As you can see, stream #0:1, called DJI.meta, is of an unknown data format. I just want to extract the raw data of this stream to a file. So that is the ffmpeg command I tried :


ffmpeg -i .\DJI_0001.MOV -map 0:1 metadata


But using this command results in the following error :


Unable to find a suitable output format for 'metadata'
metadata: Invalid argument


How can I tell ffmpeg that the data should not be formated, so that only the raw data is extracted ?


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