Player not dropping frames, need direction on configuration

[jmiller2]

I am looking at ff_ffplay_def.h There any several constants defined but I cannot find any doc on how setting them affects performance. I plan to put MIN_FRAMES back down to 5 because I don't want to have a lag at startup (I saw another thread on that). However, I am also seeing that the player is not dropping any frames so it gets behind. I want the player to drop frames and keep up as much as possible with the incoming stream as it is from a live camera.

So what do I change to affect frame dropping?

It looks like I may need to modify two things:

1. change av_sync_type from AV_SYNC_AUDIO_MASTER to AV_SYNC_VIDEO_MASTER especially since I have no audio and
2. modify DEFAULT_MAX_HIGH_WATER_MARK_IN_MS since I reduced MIN_FRAMES to 5.

Not sure what to set #2 to or if that is even correct.... thanks for any direction

[bbcallen]

For android, setAvCodecOption().
For ios, use IJKFFOptions.
Both functions call ijkmp_set_codec_option(), with which you can set ffmpeg options directly, to drop frames/loopfilter in decoder.

Or, you can switch to AV_SYNC_VIDEO_MASTER, which will slow down audio, when video falls behind.

XX_WATER_MARK_XX doesn't effect performance, it just effect how player pre-read data while streaming high bitrate video in bad network traffic condition. I don't known how it works in different situations that I haven't tested, so I can't gurante anything about that.

If you don't care buffering issues, just set them all to zero, or remove codes related.