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• ffmpeg) Where should I put the 'loop code' in concat ?

  7 mars 2020, par vaman

  I’m new here.
  I have 3 video files.(intro.mp4, main.mp4, outro.mp4)
  I’m trying to make main.mp4 loop 3 times between intro.mp4 and outro.mp4.
  Here’s the code. All I know about loop code is -stream_loop 3 -i main.mp4 -c copy\ Where should I put that code ? or How can I do ?

  ffmpeg -i intro2.mp4 -i MainLoop.mp4 -i Outro.mp4 -filter_complex  "[0:v]fade=type=out:duration=10:start_time=20,setpts=PTS-STARTPTS[v0];  [1:v]fade=type=in:duration=3,fade=type=out:duration=5:start_time=8,setpts=PTS-STARTPTS[v1];  [2:v]fade=type=in:duration=2,setpts=PTS-STARTPTS[v2];  [v0][0:a][v1][1:a][v2][2:a]concat=n=3:v=1:a=1[v][a]"  -map "[v]" -map "[a]" output.mp4

• Anomalie #3851 : Référencer code.plugins.spip.net

  1er novembre 2016, par jluc -

  Bonne idée

  mais pour les pages de plugins.spip.net il y a plus simple que parser le .txt ou changer la DTD : tester si l’url de phpdoc existe : juste tester si http://code.plugins.spip.net/albums existe et ne renvoie pas une 404, et alors mettre le lien PHPDOC vers cettre url

• Start Android Java VM from native C code NDK (ffmpeg mediacodec use)

  19 avril 2021, par eusoubrasileiro

  I managed to cross-compile ffmpeg using the NDK for armv8a api 27 with MediaCodec hardware acceleration support.

  


  Using root after setting permissions, folders and setting properly LD_LIBRARY_PATH etc. I can run it without problems on a terminal session (ssh). Only if I don't try to use the -hwaccel option.

  


  If try to run something using -hwaccel, like :

  


  ffmpeg -rtsp_transport tcp -an -hwaccel mediacodec -c:v hevc_mediacodec -i rtsp://user:pass@192.168.0.100:554/onvif1 -f null - -benchmark


  


  I get the error bellow about No Java virtual machine.

  


  ...
Input #0, rtsp, from 'rtsp://user:pass@192.168.0.100:554/onvif1':
  Metadata:
    title           : H.265 Video, RtspServer_0.0.0.2
  Duration: N/A, start: 0.000000, bitrate: N/A
    Stream #0:0: Video: hevc (Main), yuv420p(tv, bt470bg), 1920x1080 [SAR 1:1 DAR 16:9], 10 fps, 10 tbr, 90k tbn, 10 tbc
    Stream #0:1: Audio: pcm_alaw, 8000 Hz, mono, s16, 64 kb/s
[amediaformat @ 0x7e2ea27300] No Java virtual machine has been registered
[hevc_mediacodec @ 0x7e2eb44f00] Failed to create media format
Stream mapping:
  Stream #0:0 -> #0:0 (hevc (hevc_mediacodec) -> wrapped_avframe (native))
Error while opening decoder for input stream #0:0 : Generic error in an external library


  


  Would it be possible to start (create or launch ?) the Dalvik Java VM directly from the C code ? I don't even know if those are correct terms. Make it visible for ffmpeg ?

  


  Any information that will help a Android Newbie get on his feet will be greatly appreciated. If that is possible I would write a little patch on the ffmpeg code.

  


  I really would not like to package this in an app only to be able to test around with this.