Hello, First of all, thank you to this amazing community of developers! I have received a tremendous amount of help both directly and indirectly thanks to you all.
I am in need of some help regarding reading encoded video udp packets and decoding them into a Qt display. I have managed to read the video packets and display them in Qt but video playback 'stutters'. Checking the FPS of frames transmitted via the FFMpeg library to Qt, I get ~30 frames per second, so I'm led to believe that FFMpeg itself is sending me the same frames multiple times a second. All of the relevant code chunks are here: http://pastebin.com/9gaYDaYD. Here are the steps I took: 1. Broadcast an H.264 encoded video stream via VLC to udp:/238.38.38.38:1234 2. Use FFMpeg lib to decode the stream. -- I have a periodic timer that requests the latest frame from FFMpeg. If I set the timer to a low rate (20 FPS), I get the video played back but at a slow rate. If I set the timer to a high rate (60 FPS), I get the frames as soon as they are ready, but the video stutters. I figured that I should request the frames back as fast as possible. Note that I have placed the demuxing/decoding of the UDP stream on a separate thread from the displaying of the frames as per avplay. Any insight on how to avoid the stuttering is appreciated. 3. Send the QImage back to Qt to be displayed -- I have tested the frames received by my Qt callback per second and can confirm that I am receiving ~ 30 FPS which leads me to believe the stuttering is caused by FFMpeg lib. 4. I also wrote an interrupting callback to be called by FFMpeg if any of the blocking functions (i.e. av_read_frame) took too long (see Pastebin link) Although I sometimes do receive the "Video Timed Out!" call, the av_read_frame function still blocks... Any help would be greatly appreciated! -- View this message in context: http://libav-users.943685.n4.nabble.com/FFmpeg-lib-UDP-Qt-issues-tp3813581p3813581.html Sent from the libav-users mailing list archive at Nabble.com. _______________________________________________ Libav-user mailing list [email protected] http://ffmpeg.org/mailman/listinfo/libav-user
