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• Play MJPEG stream to v4l2loopback device

  28 juillet 2020, par ahoffer

  I have a RaspberryPi with a V1 camera.

  


  I want to use it as my camera for Zoom, Teams, and other virtual meetings.

  


  I have the RaspberryPi streaming motion JPEG over http using the application named "Motion".

  


  I created a v4l2 dummy device on my linux laptop as a virtual camera.

  


  However, I can't get the mjpeg stream to play to the v4l2 dummy device with the simple command :

  


  ffmpeg  -i "http://milan.local:8081" -map 0:v  -f v4l2 /dev/video4

  


  The result is :

  


  Input #0, mpjpeg, from 'http://milan.local:8081':
  Duration: N/A, bitrate: N/A
    Stream #0:0: Video: mjpeg, yuvj420p(pc, bt470bg/unknown/unknown), 640x480 [SAR 1:1 DAR 4:3], 25 tbr, 25 tbn, 25 tbc
Stream mapping:
  Stream #0:0 -> #0:0 (mjpeg (native) -> rawvideo (native))
Press [q] to stop, [?] for help
[v4l2 @ 0x55a04567bbe0] Unknown V4L2 pixel format equivalent for yuvj420p
Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument
Error initializing output stream 0:0 --


  


  ---

  


  What options am I missing from my ffmpeg command ?

  


• Fuji .mov file converted by ffmpeg doesn't play in Windows Media Player [closed]

  30 août 2023, par glipster

  My Fuji X-T3 generates an FHD movie as a .mov with HEVC video and PPM audio. The new Media Player on Windows won't play this (without buying a codec) so I convert it to .mp4 using ffmpeg CLI (ffmpeg -i in.mov out.mp4). The resulting .mp4 file uses AVC video and AAC LC audio. This plays fine in VLC, but will not play in Windows Media Player nor Media Player. I've experimented with various options, but nothing seems to work.
For the original source .mov file, MediaInfo identifies 3 streams :
1stVid : English, 201Mb/s, 1920*1080 (16:9), at 29.970 FPS, HEVC (Main10@L5.2@High)
1stAud : english, 2304 kb/s, 48.0 hKz, 24 bits, 2 channels,PCM (Little/Signed)
1 : QuickTime TC

  


  The Output .mp4 file shows :
1stVid : English 3312kb/s, 1920*1080 (16:9) at 29.970 FPS, AVC (High 10@L4)(CABAC/4 RefFrames)
1stAud : English 132 kb/s, 48.0 kHz, 2 channels, AC LC
1 : QuickTime TC

  


  Using ffmpeg CLI, I tried changing the bitrates for the video and audio, I tried removing the timecode stream, tried a different AAC codec, tried moving the metadata to the front (-movflags faststart), also tried -strict experimental, tried first converting to .mkv (which does work) and then converting to .mp4 (with and without copy). I had hoped one of these might work ; but nothing has worked thus far.

  


  Has anyone else solved this problem ? Any help would be greatly appreciated.

  


• play audio (stream) with ffmpeg on iphone

  22 août 2011, par The Psicopath

  i compiled FFMpeg and i have put them in the xcode project, i don't found in the net any tutorial for stream a wma file with this lib, someone have any tutorial links ? (or can make me any example ?)
  thanks !