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• FFMPEG corrupting audio data when trying to edit metadata

  25 mai 2016, par Matthew Goode

  I’m trying to use FFMPEG to edit some metadata in Powershell. My problem is that FFMPEG simply outputs an audio file with the correct metadata, but the audio does not play. The length of the track is reduced to a fraction of a second. Here is the command I’m using in Powershell :

  & $ffmpeg -y -i $flac.fullname -c copy -metadata track="$tracknumber" $flac.fullname

  Previously, I tried having -map 0:0 in there too, but it didn’t make a difference. Thanks for any help.

  Edit : I’m not sure if this is intentional behavior or not, but if I change the output path to be a new destination (rather than saving over the old destination) it does work correctly. So as a workaround, I’m just using a temp folder as an output then moving the files back to where I want them.

• Fix corruption when using encoder_reconfig() with some parameters

  23 avril 2016, par Anton Mitrofanov

  Fix corruption when using encoder_reconfig() with some parameters
  Changing parameters that affects SPS, like —ref for example, wasn’t
  
  behaving correctly previously.
  Probably a regression in r2373.
  

  • [DH] encoder/encoder.c
  • [DH] encoder/set.c
  • [DH] encoder/set.h

• Stream OpenGL framebuffer over HTTP (via FFmpeg)

  17 juin 2016, par mOfl

  I have an OpenGL application of which rendered images need to be streamed over internet to mobile clients. Previously, it sufficed to simply record the rendering into a video file, which is already working, and now this should be extended to subsequent streaming.

  What is working right now :

  • Render a scene to an OpenGL framebuffer object
  • Capture the FBO content using NvIFR
  • Encode it to H.264 using NvENC (no CPU round trip required)
  • Download the encoded frame to host memory as a byte array
  • Append this frame to a video file

  None of this steps involves FFmpeg or any other library so far. I now want to replace the last step with "Stream the current frame’s byte array over internet" and I assume that using FFmpeg and FFserver would be a reasonable choice for this. Am I correct ? If not, what would be the proper way ?

  If so, how do I approach this within my C++ code ? As pointed out, the frame is already encoded. Also, there is no sound or other stuff, simply a H.264 encoded frame as byte array that is updated irregularly and should be converted into a steady video stream. I assume that this would be FFmpeg’s job and that the subsequent streaming via FFserver would be simple from there. What I don’t know is how to feed my data to FFmpeg in the first place, as all FFmpeg tutorials I found (in a non-exhaustive search) work on a file or webcam/capture device as data source, not volatile data in main memory.

  The file mentioned above that I am already able to create is a C++ file stream to which I append each single frame, meaning that different framerates of video and rendering are not treated correctly. This also needs to be taken care of at some point.

  Can somebody point me in the right direction ? Can I forward data from my application to FFmpeg to build a proper video feed without writing to the hard disk ? Tutorials are greatly appreciated. By the way FFmpeg/FFserver is not mandatory. If you have a better idea for streaming of OpenGL framebuffer contents, I’m eager to know.