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• Changing container using FFMPEG produces NAL unit error

  28 avril 2015, par Mazze

  Background :

  My current videofile is put in a Linux based system that streams content (RTP) to other users. I’m filming and sending the content to the server after I change the and make sure the encoding is correct I stumble upon issues.

  I’ve tried doing this using ffmpeg, however the system I’m injecting this file in won’t recognize it and stream it to another device.

  I’m doing all the transcoding and such on a Windows system

  C:\Users\mazdak\Documents\Projects\ffmpeg\bin>ffmpeg -y -i input.mp4 -pix_fmt yuv420p -c:v libx264 -profile:v main -level:v 4.1 -color_range 0 -colorspace bt709 -x264opts colorprim=bt709:transfer=bt709:bframes=1 -an output.mkv

  Error :
  What I’m getting is

      StreamMedia exception ry: Unexpected NAL unit type: 9
  
      (...)
  
      StreamMedia exception ry: First media frame must be sync point

  Maybe I’m not preparing it for RTSP ? Is that the issue. Cause what I see is that the files that are able to stream are encoded using Gstreamer

  So I thought.. perhaps ffmpeg does not do that ? well let’s give gst-launch a try.
  I need pointers as to how to go about this.

  What I have :

  • OSSBuild of GStreamer
  • ffmpeg utils
  • input.mp4 - H264 Main profile L3.1 - Pixel format yuvj420p
  • Audio in container

  What I need (probably) :

  • output.mkv- H264 Main profile L4.1 - Pixel format yuv420p - RTP prepared (rtph264pay module)

  • Audio removed

  I have h264_analyze output from both the movie I filmed. From the movie that is successfully streamed, and the movies from my attempts with ffmpeg

• Piping stdout on windows to docker container running linux

  13 avril 2015, par kolpax

  I need to pipe the output of a program that only runs on Windows, to another program that only runs on Linux. (The programs are very similar to FFMPEG in functionality so for testing I’m piping FFMPEG stdout on Windows to FFMPEG stdin on Linux.)

  I am using Docker to run a Linux container on Windows. Docker supports piping data from the host to the Docker container like this :

  ffmpeg -i <input /> -c:a copy -v:a copy -f mpegts - | docker run ffmpeg-container -f mpegts -i - -c:a copy -c:v copy <output>
  
  </output>

  But Docker on Windows runs in a virtual machine and doesn’t have a native client, which means I can’t pipe directly to the container. So far I haven’t been able to find any examples or discussions about piping data through the virtual machine on Windows.

  I have tried alternative solutions like using netcat for piping but it has a much too slow throughput :

  Windows :

  ffmpeg -i <input /> -c:a copy -v:a copy -f mpegts - | ncat <ip address="address"> <port>
  
  </port></ip>

  Linux :

  nc -l <ip address="address"> <port> | ffmpeg -f mpegts -i - -c:a copy -c:v copy <output>
  
  </output></port></ip>

  Transcoding purely in Windows yields about 100 FPS, while the netcat solution runs at 0.1 FPS. I am hoping that piping directly will give a better result.

  Other solutions I’ve tried involve streaming the data from FFMPEG to FFMPEG using UDP - just to have the output come out of stdout, but the data was corrupted during the transfer. I suspect the problem was in the packets arriving out of order.

  Any solutions similar to these will be greatly appreciated. The content is video data so solutions that uses FFMPEG to get the data across are acceptable.

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

  30 mars 2015, 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.