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• Concat 2 H264 mov into mp4 using ffmpeg or other ?

  19 septembre 2013, par pixelwiz

  We recently bought a JVC GY-HM650U camcorder. One of the things it can do is record into a "web" format at the same time it records HD. However, the problem we've ran into is that it splits up the recording about every 30 minutes. I've contacted the manufacturer and they might fix the firmware in the future, but I need to do something about it now. So the camera produces an MOV file, but it's supposed to be a H.264 mp4 under the surface. I tried to follow the steps here : http://ffmpeg.org/trac/ffmpeg/wiki/How%20to%20concatenate%20%28join,%20merge%29%20media%20files but was not successful. I can either merge the two files into one mov, and if I try to play the MOV in JWPlayer for some reason I lose the audio. If I try to go into a .mp4 I get an error. I found some 3rd party software for joining video files without having to re-encode them if they are already encoded the same way, but none proved successful at producing a playable file with audio. Any suggestions ?

• dxva2_h264 : set the correct ref frame index in the long slice struct

  4 mars 2014, par Hendrik Leppkes

  dxva2_h264 : set the correct ref frame index in the long slice struct
  The latest H.264 DXVA specification states that the index in this
  
  structure should refer to a valid entry in the RefFrameList of the picture
  
  parameter structure, and not to the actual surface index.
  Fixes H.264 DXVA2 decoding on recent Intel GPUs (tested on Sandy and Ivy)
  Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] libavcodec/dxva2_h264.c

• FFmpeg raw h.264 set pts value

  19 mai 2020, par thecaptain0220

  I am currently using ffmpeg to convert a custom container media format to mp4. It is straightforward to dump all the h.264 frames to one file and the aac audio to another. Then I can combine the two and create an mp4 file with ffmpeg.

  



  The problem is that the video source isn't always perfect. From time to time frames are dropped or late etc. This causes an A/V sync issue since the pts is generated using a constant rate by ffmpeg. The source format I am using has the PTS value but I cant figure out a way to pass it to ffmpeg with the raw h.264 frames.

  



  I suppose it would be possible to create a demuxer for the custom format, but it seems like a lot effort. I looked into ffmpeg's .nut container format thinking that I might be able to convert from the custom container to .nut first. Unfortunately it seems more complex than it looks on the surface.

  



  It seems like there should be an easy way to pass a frame and its PTS value to ffmpeg, but I haven't come across it yet. Any help would be appreciated.

  



  Here is the ffmpeg command I am using

  



  ffmpeg -f s16le -ac 1 -ar 48k -i source.audio -framerate 20 -i source.video -c:a aac -b:a 64k -r 20 -c:v h264_nvenc -rc:v vbr_hq -cq:v 19 -n out.mp4