delayed video on rtsp stream

[tulkas85]

I have about 6 seconds of delay on live video rtsp streams in local wifi network, using vlc app I have only 1 second of delay using same source.
Is possible to reduce this time ?
I use Android tv.danmaku.ijk.media.widget.VideoView

[bbcallen]

Modify these macros to reduce latency.

#define DEFAULT_HIGH_WATER_MARK_IN_BYTES    (128 * 1024)

#define DEFAULT_MAX_HIGH_WATER_MARK_IN_MS       (5 * 1000)
#define DEFAULT_NORMAL_HIGH_WATER_MARK_IN_MS    (2 * 1000)
#define DEFAULT_FAST_HIGH_WATER_MARK_IN_MS      (100)

#define MAX_QUEUE_SIZE (15 * 1024 * 1024)
#define MIN_FRAMES 50000

[bbcallen]

FYI, The original MIN_FRAMES in ffplay is

#define MIN_FRAMES 5

[tulkas85]

Thank you, but I have now other questions.

I must change these values af ff_ffplay_def.h , is right ?
Can you suggest me some value ?
I could set

#define DEFAULT_MAX_HIGH_WATER_MARK_IN_MS       ( 1000)
#define DEFAULT_NORMAL_HIGH_WATER_MARK_IN_MS    (500)
#define DEFAULT_FAST_HIGH_WATER_MARK_IN_MS      (100)
#define MIN_FRAMES 5

but these ????

#define DEFAULT_HIGH_WATER_MARK_IN_BYTES    (128 * 1024)
#define MAX_QUEUE_SIZE (15 * 1024 * 1024)

After edit file, from which step of your guide I have to start with the compilation? ndk-build ???

I've read something about analyzeDuration :
https://bbs.vitamio.org/topics/220/parts/51751e9d1b27a78e1c0000fe?locale=zh-CN

It can help ?

[bbcallen]

Your value is fine, ndk-build is enough.

The macros should work with HLS. But for rtsp/rtmp/etc, I don't have much knowledge about them.

The analyzeDuration can be set through ijkmp_set_codec_option(), which could be easily exposed to java layer as ijkmp_set_format_option() does.

[tulkas85]

with these values I have a delay of 3 secs ... now is better.
I have rtsp stream, so this values work with rtsp too.
But now how can I further reduce the delay?

[bbcallen]

Set these values to 0 is OK. In fact, the original ffplay doesn't have these limit.

#define DEFAULT_MAX_HIGH_WATER_MARK_IN_MS       (0)
#define DEFAULT_NORMAL_HIGH_WATER_MARK_IN_MS    (0)
#define DEFAULT_FAST_HIGH_WATER_MARK_IN_MS      (0)

I add them for streaming video on network with bad quality traffic.

Also have a look at these code commented out by me.

#ifdef FFP_MERGE
        if (is->paused != is->last_paused) {
            is->last_paused = is->paused;
            if (is->paused)
                is->read_pause_return = av_read_pause(ic);
            else
                av_read_play(ic);
        }
#endif
#if CONFIG_RTSP_DEMUXER || CONFIG_MMSH_PROTOCOL
        if (is->paused &&
                (!strcmp(ic->iformat->name, "rtsp") ||
                 (ic->pb && !strncmp(ffp->input_filename, "mmsh:", 5)))) {
            /* wait 10 ms to avoid trying to get another packet */
            /* XXX: horrible */
            SDL_Delay(10);
            continue;
        }
#endif

I'm not sure if they are related to the delay.

[tulkas85]

I confirm that MIN_FRAMES 5 reduce delay, but video stream is less stable on long durate. Videoview often goes in error state.
I don't see improvements by varying other parameters

[bbcallen]

No idea at all. Try your local ffplay from apt-get, yum, macport, hombrew, blablabla.

[loveq369]

What's the meaning "FFP_MERGE".

[adilmalik07]

I'm getting a delay of 4-7 seconds on iOS using this library while ffplay has <=1 second delay on mac using local wifi. Any idea how to resolve this issue?

[progamertr]

Which client do you get under 1 second latency ?

Are you sure that both your clients use same transport layer ?

[adilmalik07]

I try to play stream using ffplay from terminal and there was a latency for ~1 second.

Also what is the best to integrate this library in another project because currently files being used are very scattered.

[jsumitro-appscore]

I try to play an UDP stream and I am experiencing a significant delay, about 7 seconds.
I have modify the macros in ff_ffplay_def.h and re-compile the library by running the compile-ffmpeg and compile-ijk again. However, the delays remains the same.

Any idea why? Is there any macros that needs to be changed as well?