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• Is there a way if a video file has pixelation in FFmpeg ?

  14 novembre 2019, par A Person

  I am trying to identify if a video file has pixelation or not,

  Currently, I have a watch folder where videos are dropped, I have a trigger every 120 seconds that check the folder to see if there are any video files.
  If there is a file, it uses MediaInfo command-line to extract the encoding of the video and audio.
  I also use ffprobe on a video to see if it throws out an error like moov atom not found to know if the video is corrupted.

  However, I want to be able to tell if a video file has a pixelation. I know that I can use str, std, to print out the debug logs.

  However, I am finding it difficult to find documentation on how to detect pixelation.

  Do you guys know if there a way to tell that a video file may have pixelation, even through a log output of the video ?

  I am already running a script that reads a log and finds information on the log to tell me about packet drops in a stream, so if you know how I output such log that tells if there is pixelation, or if the debug log has certain information that tells this, please let me know.

• C++ FFMPEG decoder gives -22

  15 mars 2016, par KillerZefi

  I have implemented a video streaming server (video : MPEG1, network : UDP), which seem to be working (I can watch the videos using VLC).

  I want to implement a client for decoding and I’m using this code : FFmpeg decode raw buffer with avcodec_decode_video2

  The problem is, that I always get -22 for nres and 0 for framefinished. I also had a client, that I implemented earlier, and it had the very same problem. The code for calling my method :

  uint8_t inbuf[65500];
  
  memset(inbuf, 0, size + FF_INPUT_BUFFER_PADDING_SIZE);
  
  memcpy(inbuf, recv_buffer->data(), size);
  
  decoder2.decodeStreamData(inbuf, size + FF_INPUT_BUFFER_PADDING_SIZE);

  Any hints for the cause of the problem ? Or can I find the description of this magical -22 ?

• Multi-Threaded Video Decoder Leaks Memory

  3 janvier 2018, par Cethric

  My intention is to create a relatively simple video playback system to be used in a larger program that I am working on. Relevant code to the video decoder is here. The best I have been able to do so far is narrow down the memory leak to this section of code (or rather I have not noticed any memory leaks occurring when video is not used).

  This is probably a very broad question how ever I am unsure of the scope of the issue I am having and as such of how to word my question.

  What I want to know is what have I missed or done wrong that has lead to a noticeable memory leak (by noticeable I mean I can watch memory usage climb megabytes per minute). I have tried ensured that every allocation that I make is matched by a deallocation.

  EDIT 1
  This is to be built on a Windows 10 machine running MSYS2 (MinGW64)