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• How to convert raw H.264 stream from video call to mp4 file

  13 février 2020, par Daniel

  I have captured a SIP point to point video call using wireshark and I used the program ’videosnarf’ on Ubuntu 12.04 to extract the raw H.264 stream from the PCAP. I am having some problems with ffmpeg when trying to convert it to MP4. Below is the ffprobe output :

  [STREAM]
  
  index=0
  
  codec_name=h264
  
  codec_long_name=H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10
  
  codec_type=video
  
  codec_time_base=1/2400000
  
  codec_tag_string=[0][0][0][0]
  
  codec_tag=0x0000
  
  width=704
  
  height=396
  
  has_b_frames=0
  
  sample_aspect_ratio=1:1
  
  display_aspect_ratio=16:9
  
  pix_fmt=yuv420p
  
  level=51
  
  r_frame_rate=25/1
  
  avg_frame_rate=25/1
  
  time_base=1/1200000
  
  start_time=N/A
  
  duration=N/A
  
  [/STREAM]

  Here is the command I used to generate the MP4 :

  ffmpeg -f h264 -i H264-media-3.264 -vcodec copy output.mp4

  When I transfer the file to my Windows PC, I can’t open the file in VLC. When opening in Windows Media Player (not sure the version but it’s on Windows 8) it plays but very quickly (almost as if it’s playing in fast forward. I also tried with :

  ffmpeg -f h264 -i H264-media-3.264 -vcodec copy -r 25 output.mp4

  I am able to play the raw H.264 stream using "MPC-HC" on Windows but I need it in MP4 format.

• Streaming ALSA to rtsp stream using ffmpeg

  12 février 2019, par Demosthenes

  I would like to stream audio captured using an ALSA microphone with ffmpeg. I can capture the video to a file, what I want is ffmpeg to start an rtsp server which can be accessed by (multiple) clients in my local network. But I can’t even make it work with one client so far.

  What I tried so far :

  ffmpeg -f alsa -ac 1 -ar 44100 -i hw:1,0  -t 10 test.wav

  This is working perfectly. File is saved and can be played back. So input is alright.

  ffmpeg -f alsa -ac 1 -ar 44100 -i hw:1,0  -f rtsp rtsp_transport tcp rtsp://localhost:8090/live.sdp

  Trying this dry will result in an error it cannot connect to the server. Which is odd, I want to tell ffmpeg to start a server. So I’m starting one using

  ffserver ffserver.conf

  with a config file containing

  Port 8090
  
  BindAddress 0.0.0.0
  
  MaxHTTPConnections 2000
  
  MaxClients 1000
  
  MaxBandwidth 1000
  
  CustomLog -
  
  NoDaemon
  
  <feed>
  
  </feed>

  This starts a server, or so it would seem. Now, trying the ffmpeg command from above again, I get

  [tcp @ 0x11d2490] Connection to tcp://localhost:8090?timeout=0 failed (Connection refused), trying next address
  
  Could not write header for output file #0 (incorrect codec parameters ?): Invalid data found when processing inputStream mapping:
  
    Stream #0:0 -> #0:0 (pcm_s16le (native) -> aac (native))
  
      Last message repeated 1 times

  So I thought, maybe I should state an output codec, so :

  ffmpeg -f alsa -ac 1 -ar 44100 -i hw:1,0 -codec:a libmp3lame -q:a 2  -f rtsp rtsp_transport tcp rtsp://localhost:8090/live.sdp

  which gives pretty much the same error, just with a different codec :

  [tcp @ 0x24d8630] Connection to tcp://localhost:8090?timeout=0 failed (Connection refused), trying next address
  
  Could not write header for output file #0 (incorrect codec parameters ?): Invalid data found when processing inputStream mapping:
  
    Stream #0:0 -> #0:0 (pcm_s16le (native) -> mp3 (libmp3lame))
  
      Last message repeated 1 times

  Any hints to what I am missing ?

• Node.js : realtime conversion from jpeg images to video file

  15 mai 2020, par MastErAldo

  I'm using node.js and through the socket.io library I receive chunks of data that are actually jpeg images. These images are frames of a realtime video captured from a remote webcam. I'm forced to stream the video as jpeg frames. I'm looking for a way to convert on the fly these jpeg images in a video file (mpeg 4 or mjpeg file). Does node have a library that can do this ? I already took a look at the Node-fluent-FFMPEG library but the only examples given were about conversions of jpeg files to a video and not a conversion on the fly from a stream of jpeg images. Or alternatively, does ffmpeg for windows support a stream of jpeg images as input ?