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Autres articles (74)
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Use, discuss, criticize
13 avril 2011, parTalk to people directly involved in MediaSPIP’s development, or to people around you who could use MediaSPIP to share, enhance or develop their creative projects.
The bigger the community, the more MediaSPIP’s potential will be explored and the faster the software will evolve.
A discussion list is available for all exchanges between users. -
MediaSPIP v0.2
21 juin 2013, parMediaSPIP 0.2 est la première version de MediaSPIP stable.
Sa date de sortie officielle est le 21 juin 2013 et est annoncée ici.
Le fichier zip ici présent contient uniquement les sources de MediaSPIP en version standalone.
Comme pour la version précédente, il est nécessaire d’installer manuellement l’ensemble des dépendances logicielles sur le serveur.
Si vous souhaitez utiliser cette archive pour une installation en mode ferme, il vous faudra également procéder à d’autres modifications (...) -
HTML5 audio and video support
13 avril 2011, parMediaSPIP uses HTML5 video and audio tags to play multimedia files, taking advantage of the latest W3C innovations supported by modern browsers.
The MediaSPIP player used has been created specifically for MediaSPIP and can be easily adapted to fit in with a specific theme.
For older browsers the Flowplayer flash fallback is used.
MediaSPIP allows for media playback on major mobile platforms with the above (...)
Sur d’autres sites (12117)
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Terminate ffmpeg.exe loop
5 mars 2019, par jinahoGetting a thumbnail from a RTSP source results in infinit output from ffmpeg without exiting which makes the batch script not resume.
It is basically only one line that calls the ffmpeg process like this (example) :
ffmpeg -i rtsp://192.168.1.89:554/11 -f image2 -r 1 thumb%03d.jpgThe input is user generated and for some ffmpeg is not returning a thumbnail but a warning message :
Could not find codec parameters for stream 0 (Video: h264, 1 reference frame, none(left), 1280x720, 1/180000): unspecified pixel formatAfter that instead of quiting and let the batch script resume, ffmpeg outputs :
Press [q] to stop, [?] for help
frame= 0 fps=0.0 q=0.0 size=N/A time=-577014:32:22.77 bitrate=N/A speed=N/A
frame= 0 fps=0.0 q=0.0 size=N/A time=-577014:32:22.77 bitrate=N/A speed=N/A
frame= 0 fps=0.0 q=0.0 size=N/A time=-577014:32:22.77 bitrate=N/A speed=N/A
frame= 0 fps=0.0 q=0.0 size=N/A time=-577014:32:22.77 bitrate=N/A speed=N/A
frame= 0 fps=0.0 q=0.0 size=N/A time=-577014:32:22.77 bitrate=N/A speed=N/A
frame= 0 fps=0.0 q=0.0 size=N/A time=-577014:32:22.77 bitrate=N/A speed=N/A
frame= 0 fps=0.0 q=0.0 size=N/A time=-577014:32:22.77 bitrate=N/A speed=N/A
frame= 0 fps=0.0 q=0.0 size=N/A time=-577014:32:22.77 bitrate=N/A speed=N/A
frame= 0 fps=0.0 q=0.0 size=N/A time=-577014:32:22.77 bitrate=N/A speed=N/A
frame= 0 fps=0.0 q=0.0 size=N/A time=-577014:32:22.77 bitrate=N/A speed=N/A
frame= 0 fps=0.0 q=0.0 size=N/A time=-577014:32:22.77 bitrate=N/A speed=N/A
frame= 0 fps=0.0 q=0.0 size=N/A time=-577014:32:22.77 bitrate=N/A speed=N/A
frame= 0 fps=0.0 q=0.0 size=N/A time=-577014:32:22.77 bitrate=N/A speed=N/A
frame= 0 fps=0.0 q=0.0 size=N/A time=-577014:32:22.77 bitrate=N/A speed=N/AThis goes on forever meaning that the batch script does not resume. Manual invertention is required which is not intended.
I am looking for a way to tell the script that ffmpeg has a hanging condition and make the script quit ffmpeg so it can resume. -
Understanding PTS and DTS in video frames
8 août 2015, par theateistI had fps issues when transcoding from avi to mp4(x264). Eventually the problem was in PTS and DTS values, so lines 12-15 where added before av_interleaved_write_frame function :
1. AVFormatContext* outContainer = NULL;
2. avformat_alloc_output_context2(&outContainer, NULL, "mp4", "c:\\test.mp4";
3. AVCodec *encoder = avcodec_find_encoder(AV_CODEC_ID_H264);
4. AVStream *outStream = avformat_new_stream(outContainer, encoder);
5. // outStream->codec initiation
6. // ...
7. avformat_write_header(outContainer, NULL);
8. // reading and decoding packet
9. // ...
10. avcodec_encode_video2(outStream->codec, &encodedPacket, decodedFrame, &got_frame)
11.
12. if (encodedPacket.pts != AV_NOPTS_VALUE)
13. encodedPacket.pts = av_rescale_q(encodedPacket.pts, outStream->codec->time_base, outStream->time_base);
14. if (encodedPacket.dts != AV_NOPTS_VALUE)
15. encodedPacket.dts = av_rescale_q(encodedPacket.dts, outStream->codec->time_base, outStream->time_base);
16.
17. av_interleaved_write_frame(outContainer, &encodedPacket)After reading many posts I still do not understand :
outStream->codec->time_base= 1/25 andoutStream->time_base= 1/12800. The 1st one was set by me but I cannot figure out why and who set 12800 ? I noticed that before line (7)outStream->time_base= 1/90000 and right after it it changes to 1/12800, why ?
When I transcode from avi to avi, meaning changing the line (2) toavformat_alloc_output_context2(&outContainer, NULL, "avi", "c:\\test.avi";, so before and after line (7)outStream->time_baseremains always 1/25 and not like in mp4 case, why ?- What is the difference between time_base of
outStream->codecandoutStream? - To calc the pts
av_rescale_qdoes : takes 2 time_base, multiplies their fractions in cross and then compute the pts. Why it does this in this way ? As I debugged, theencodedPacket.ptshas value incremental by 1, so why changing it if it does has value ? - At the beginning the dts value is -2 and after each rescaling it still has negative number, but despite this the video played correctly ! Shouldn’t it be positive ?
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Understanding PTS and DTS in video frames
28 juin 2017, par theateistI had fps issues when transcoding from avi to mp4(x264). Eventually the problem was in PTS and DTS values, so lines 12-15 where added before av_interleaved_write_frame function :
1. AVFormatContext* outContainer = NULL;
2. avformat_alloc_output_context2(&outContainer, NULL, "mp4", "c:\\test.mp4";
3. AVCodec *encoder = avcodec_find_encoder(AV_CODEC_ID_H264);
4. AVStream *outStream = avformat_new_stream(outContainer, encoder);
5. // outStream->codec initiation
6. // ...
7. avformat_write_header(outContainer, NULL);
8. // reading and decoding packet
9. // ...
10. avcodec_encode_video2(outStream->codec, &encodedPacket, decodedFrame, &got_frame)
11.
12. if (encodedPacket.pts != AV_NOPTS_VALUE)
13. encodedPacket.pts = av_rescale_q(encodedPacket.pts, outStream->codec->time_base, outStream->time_base);
14. if (encodedPacket.dts != AV_NOPTS_VALUE)
15. encodedPacket.dts = av_rescale_q(encodedPacket.dts, outStream->codec->time_base, outStream->time_base);
16.
17. av_interleaved_write_frame(outContainer, &encodedPacket)After reading many posts I still do not understand :
outStream->codec->time_base= 1/25 andoutStream->time_base= 1/12800. The 1st one was set by me but I cannot figure out why and who set 12800 ? I noticed that before line (7)outStream->time_base= 1/90000 and right after it it changes to 1/12800, why ?
When I transcode from avi to avi, meaning changing the line (2) toavformat_alloc_output_context2(&outContainer, NULL, "avi", "c:\\test.avi";, so before and after line (7)outStream->time_baseremains always 1/25 and not like in mp4 case, why ?- What is the difference between time_base of
outStream->codecandoutStream? - To calc the pts
av_rescale_qdoes : takes 2 time_base, multiplies their fractions in cross and then compute the pts. Why it does this in this way ? As I debugged, theencodedPacket.ptshas value incremental by 1, so why changing it if it does has value ? - At the beginning the dts value is -2 and after each rescaling it still has negative number, but despite this the video played correctly ! Shouldn’t it be positive ?
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