Hi Ben, On Tue, Sep 10, 2019 at 06:09:30 +0100, Ben Houghton wrote: > I am helping build a node server that runs ffmpeg to stream a live > WebRTC input to HLS and MPEGDASH. Often when the encoding starts it > produces a corrupted video output that looks something like this > (viewed using VLC):
Are you saying that after a few frames the video becomes correct? > HLS output distorted image <https://i.stack.imgur.com/Dxx03.png> > MPEGDASH output distorted image <https://i.stack.imgur.com/9YQri.png> This doesn't look like an encoding error by ffmpeg, but it could be a decoding artifact. In particular if the first frame is not a keyframe or just partially received. There's possibly nothing you can do, because that's the way the stream is initially picked up. (Just guessing so far.) > Does anyone have any ideas on what might cause this type of > distortion on the output stream or how I can test further to track it > down? To see what ffmpeg is doing with your input, it would have been helpful to look at ffmpeg's complete log output. But: > ffmpeg -re -y -loglevel error -hide_banner Without "-loglevel error" and without "-hide_banner" please. To see whether the input is at fault, you would strip all the output magic and just dump a few seconds to file, by keeping all the input options, but just writing a simple file, for example: $ ffmpeg { input options } -map 0:v -map 1:a -t 5 testout.mp4 to check whether the same effects are to be seen in that file. > ffmpeg version 3.4.6 Copyright (c) 2000-2019 the FFmpeg developers Though it probably isn't part of your issue, we always recommend to test (or even use) a very recent version of ffmpeg. This rules out debugging fixed bugs. If you can't find a newer ffmpeg in some other repository, and you don't want to build yourself, you can grab a static binary from here and test with that: https://johnvansickle.com/ffmpeg/ (Left column, "git master", please.) Regards, Moritz _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".