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  • Supporting all media types

    13 avril 2011, par

    Unlike 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 (...)

  • Keeping control of your media in your hands

    13 avril 2011, par

    The 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 (...)

  • Qualité du média après traitement

    21 juin 2013, par

    Le bon réglage du logiciel qui traite les média est important pour un équilibre entre les partis ( bande passante de l’hébergeur, qualité du média pour le rédacteur et le visiteur, accessibilité pour le visiteur ). Comment régler la qualité de son média ?
    Plus la qualité du média est importante, plus la bande passante sera utilisée. Le visiteur avec une connexion internet à petit débit devra attendre plus longtemps. Inversement plus, la qualité du média est pauvre et donc le média devient dégradé voire (...)

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  • Does ffmpeg rtp_mpegts muxer support setting DVB triplet ?

    19 février 2021, par drake7

    It seems ffmpeg lets you set the DVB triplet with UDP but not with RTP.

    


    FYI : This is a followup on my findings about the rtp_mpegts muxer compared to the mpegts muxer : Question

    


    In my tests I was using ffmpeg version 4.3.1-2021-01-01-full_build-www.gyan.dev on windows.

    


    findings

    


    I analyzed my streams with dectec's "StreamXpert" :

    


      


    • With UDP and it's mpegts muxer, the DVB triplet can be set (1)

      


      • 


    • With RTP and it's rtp_mpegts muxer, the DVB triplet is ignored (3) (Note that 3a and 3b create very similar results in "StreamXpert".)

      


      • 


    • Using UDP with DVB triplet as input and output with RTP ignores the DVB triplet (2)

      


      • 



    


    Interestingly, leaving out the following options...

    


    -pcr_period 20 -pat_period 0.10 -sdt_period 0.25 -metadata:s:a:0 language=nya \
-mpegts_flags +pat_pmt_at_frames -mpegts_flags system_b


    


    ... the rtp_mpegts muxer (3b) creates a valid DVB transport stream, while the the mpegts muxer (4) does not.

    


    ffmpeg params :

    


      



    


    muxer : mpegts (udp)

    


    ffmpeg -f lavfi -i testsrc -r 25 -c:v libx264 -pix_fmt yuv420p -profile:v main -level 3.1 -preset veryfast -vf scale=1280:720,setdar=dar=16/9 -an -bsf:v h264_mp4toannexb -b:v 4M -muxrate 8M \
-pcr_period 20 -pat_period 0.10 -sdt_period 0.25 -metadata:s:a:0 language=nya -mpegts_flags +pat_pmt_at_frames \
-mpegts_transport_stream_id 0x005A \
-mpegts_original_network_id 0x005B \
-mpegts_service_id 0x005C \
-mpegts_pmt_start_pid 0x005D -mpegts_start_pid 0x005E -mpegts_service_type advanced_codec_digital_hdtv \
-metadata service_provider="Provider foo" \
-metadata service_name="Service bar" \
-mpegts_flags system_b -flush_packets 0 \
-f mpegts "udp://239.10.33.10:1234?pkt_size=1316"


    


      



    


    muxer : rtp_mpegts (rtp)

    


    ffmpeg -i "udp://239.10.33.10:1234" -map 0 -c copy \
-f rtp_mpegts "rtp://239.10.33.11:1234?pkt_size=1316"


    


      



    


    a) muxer : rtp_mpegts (rtp)

    


    ffmpeg -f lavfi -i testsrc -r 25 -c:v libx264 -pix_fmt yuv420p -profile:v main -level 3.1 -preset veryfast -vf scale=1280:720,setdar=dar=16/9 -an -bsf:v h264_mp4toannexb -b:v 4M -muxrate 8M \
-pcr_period 20 -pat_period 0.10 -sdt_period 0.25 -metadata:s:a:0 language=nya -mpegts_flags +pat_pmt_at_frames \
-mpegts_transport_stream_id 0x005A \
-mpegts_original_network_id 0x005B \
-mpegts_service_id 0x005C \
-mpegts_pmt_start_pid 0x005D -mpegts_start_pid 0x005E -mpegts_service_type advanced_codec_digital_hdtv \
-metadata service_provider="Provider foo" \
-metadata service_name="Service bar" \
-mpegts_flags system_b -flush_packets 0 \
-f rtp_mpegts "rtp://239.10.33.10:1234?pkt_size=1316"


    


    b) muxer : rtp_mpegts (rtp) (omitting some options)

    


    ffmpeg -f lavfi -i testsrc -r 25 -c:v libx264 -vf scale=1280:720,setdar=dar=16/9 -b:v 4M -muxrate 8M \
-mpegts_transport_stream_id 0x005A \
-mpegts_original_network_id 0x005B \
-mpegts_service_id 0x005C -mpegts_pmt_start_pid 0x005D -mpegts_start_pid 0x005E \
-mpegts_service_type advanced_codec_digital_hdtv \
-metadata service_provider="Provider foo" \
-metadata service_name="Service bar" \
-f rtp_mpegts "rtp://239.10.33.10:1234"


    


      



    


    muxer : mpegts (udp) (omitting some options)

    


    ffmpeg -f lavfi -i testsrc -r 25 -c:v libx264 -vf scale=1280:720,setdar=dar=16/9 -b:v 4M -muxrate 8M \
-mpegts_transport_stream_id 0x005A \
-mpegts_original_network_id 0x005B \
-mpegts_service_id 0x005C -mpegts_pmt_start_pid 0x005D -mpegts_start_pid 0x005E \
-mpegts_service_type advanced_codec_digital_hdtv \
-metadata service_provider="Provider foo" \
-metadata service_name="Service bar" \
-f mpegts "udp://239.10.33.10:1234"


    


    Analyzing the transport stream

    


    dectec's

    


  • avcodec/vc1 : fix B predictor validity for 4-MV MBs

    14 janvier 2019, par Jerome Borsboom
    avcodec/vc1 : fix B predictor validity for 4-MV MBs

    The B predictor for 4-MV MBs in interlace field pictures is not used
    
for blocks 0 and 2 when the picture is 1 MB wide.
    

    Signed-off-by : Jerome Borsboom <jerome.borsboom@carpalis.nl>
    • [DH] libavcodec/vc1_pred.c

  • Merge commit ’54bc15d5ebfd07fd468743ba29f709ea19e840b9’

    15 janvier 2015, par Michael Niedermayer
    Merge commit ’54bc15d5ebfd07fd468743ba29f709ea19e840b9’

    * commit ’54bc15d5ebfd07fd468743ba29f709ea19e840b9’ :
    
  id3v2 : fix reading v2.2 attached pictures
    

    Conflicts :
    
	libavformat/id3v2.c
    

    See : 05c3c568dccd6c42fdf6eea891d08c71fe2ee772
    
Merged-by : Michael Niedermayer <michaelni@gmx.at>
    • [DH] libavformat/id3v2.c

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