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• How to extract video+audio streams from MP4 file via ffmpeg ?

  12 août 2022, par Matthias

  I have a bunch of MP4 files from a GoPro, which include streams of metadata like GPS information. Now unfortunately when I try to open these MP4 files in any browser (tried both Firefox and Chrome on Windows and Linux), then only the audio is being played, but no video. I can, however, open the MP4 files in VLC player and that can play both video and audio without problem - so the files seem correct, just the browser cannot play them correctly.

  


  Since I need to play the MP4 files in a browser, I need to extract both the video and the audio streams from the original files and create new MP4 files out of them, in a format so that the browser can play them. I also don't want to loose any frames during conversion - it would be OK to compress the video stream a bit, so that the resulting MP4 files would be a bit smaller than the originals, but the number of frames and the FPS value and these settings must be exactly as in the original file.

  


  What would be the proper ffmpeg command to achieve this ?
  
For your reference, this is the information from ffprobe on one of the videos :

  


  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x55ce62e37a00] Using non-standard frame rate 59/1
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/winclients/ASFINAG/Abnahme/GX010005.MP4':
  Metadata:
    major_brand     : mp41
    minor_version   : 538120216
    compatible_brands: mp41
    creation_time   : 2021-06-07T15:21:10.000000Z
    location        : +48.3743+016.2383/
    location-eng    : +48.3743+016.2383/
    firmware        : HD9.01.01.00.00
  Duration: 00:08:51.54, start: 0.000000, bitrate: 60205 kb/s
    Stream #0:0(eng): Video: hevc (Main) (hvc1 / 0x31637668), yuvj420p(pc, bt709), 3840x2160 [SAR 1:1 DAR 16:9], 59941 kb/s, 59.94 fps, 59.94 tbr, 60k tbn, 59.94 tbc (default)
    Metadata:
      creation_time   : 2021-06-07T15:21:10.000000Z
      handler_name    : GoPro H.265
      encoder         : GoPro H.265 encoder
      timecode        : 15:35:51:04
    Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 189 kb/s (default)
    Metadata:
      creation_time   : 2021-06-07T15:21:10.000000Z
      handler_name    : GoPro AAC
      timecode        : 15:35:51:04
    Stream #0:2(eng): Data: none (tmcd / 0x64636D74) (default)
    Metadata:
      creation_time   : 2021-06-07T15:21:10.000000Z
      handler_name    : GoPro TCD
      timecode        : 15:35:51:04
    Stream #0:3(eng): Data: bin_data (gpmd / 0x646D7067), 47 kb/s (default)
    Metadata:
      creation_time   : 2021-06-07T15:21:10.000000Z
      handler_name    : GoPro MET
    Stream #0:4(eng): Data: none (fdsc / 0x63736466), 13 kb/s (default)
    Metadata:
      creation_time   : 2021-06-07T15:21:10.000000Z
      handler_name    : GoPro SOS
Unsupported codec with id 0 for input stream 2
Unsupported codec with id 100359 for input stream 3
Unsupported codec with id 0 for input stream 4


  


• How do I use the Windows version of gstreamer and wireshark to take a .pcap file and extract H.264 from RTP ?

  5 mars 2015, par user1118047

  I have a pcap file containing a capture of RTP with H.264 video and SIP with SDP. I would like to be able to extract the video from the RTP stream and save it to a file. (h264video.mkv or something similar)

  I have started looking at gstreamer as a possible solution for this but I’m having trouble troubleshooting any of the output I receive from the program.

  gst-launch -v     filesrc location=testh264.rtp     
  
  ! application/x-rtp,media=video,clock-rate=90000,payload=123,encoding-name=H264     
  
  ! rtph264depay                   
  
  ! ffdec_h264                     
  
  ! xvimagesink

  Here is an example of something I’ve tried but I’m not able to get through rtph264depay because the file I’m sending is of invalid format. What can I do to extract the h264 payload from my pcap file for usage with gstreamer/rtph264depay ?

• How to make Gstreamer return only keyframes ?

  5 mars 2020, par Anton Fedorov

  In gstreamer pipeline, I’m trying to figure out if there’s a way to specify that I only want key frames from a RTSP stream.

  In ffmpeg you can do this with with -skip_frame nokey flag. E.g. :

  ffmpeg -skip_frame nokey -i rtsp://184.72.239.149/vod/mp4:BigBuckBunny_175k.mov -qscale 0 -r 1/1 frame%03d.jpg

  The corresponding gstreamer command to read the RTSP feed looks like this :

  gst-launch-1.0 rtspsrc location=rtsp://184.72.239.149/vod/mp4:BigBuckBunny_175k.mov ! decodebin ! videorate ! "video/x-raw,framerate=1/1" ! videoconvert ! autovideosink

  Does anyone know if it is possible to ask gstreamer to only return keyframes ?