Slow to start iPhone video (tested in TracyPlayer)

[neckaros]

Describe the bug
In TracyPlayer from TestFlight and my own application:
Video taken from iPhone 12 Pro (the exemple i have) takes a lot of buffering time when played from URL.
It starts instantly with same URL in VLC or web browser.
It starts instantly if I download and open from file

To Reproduce
Steps to reproduce the behavior:

1. Open TracyPlayer (ex on macOS)
2. open URL: https://neckaros.000webhostapp.com/test.mov
3. it takes minutes to start playing (it stay buffering)

Expected behavior
if you open the same url in the browser or VLC it start instantly

Screenshots

Platform (please complete the following information):

• Device: MacOS
• OS: Sonoma 14.0
• Using latest TracyPlayer from test flight: Version 2.1.2 (21)

[kingslay]

这个url打不开，报错
Unable to negotiate TLS/SSL session: -9806
https://neckaros.000webhostapp.com/test.mov: Input/output error
我用vlc也是打不开

[neckaros]

It plays in VLC from my country:

Maybe it's blocked in mine?
I have the same issue on my personal server but it's not public so i found this free host. Maybe you have some place else where i can share it with a direct link?

[kingslay]

你可以把url发到我的邮箱。我的邮箱在reademe 里面有写

[neckaros]

I think i found a solution. I took another smaller video and uploaded it to Github:
https://github.com/neckaros/KSPlayer/raw/develop/2.mov

[neckaros]

Tell me if you are able to reproduce with this link otherwise I will email you

Thanks

[kingslay]

你后面给的URL可以复现这个问题了

[kingslay]

找到原因了 因为ffmpeg在下载mov视频的时候 分成很多段进行下载。所以导致很慢。而vlc只分为两段来下载。我看mpv也是分为很多段下载。 这个需要ffmpeg进行处理下 你可以用ffplay播放 也会有这个问题

[neckaros]

Thanks!
I think they found a solution here: https://stackoverflow.com/questions/61652486/ffmpeg-making-requests-for-each-frame-when-decoding-a-stream-slow-performance

not sure it apply for your implementation ?

[kingslay]

这个解决方案对于mov的视频是可以，但是在播放其他视频的，就会出问题了。而且不好控制buffer_size。当用户拍摄的mov视频很大，超过buffer_size的大小的话。那还是会继续卡顿

[neckaros]

thanks again for all your help!

Would it be possible to apply only on MOV containers and obtain the buffer size like he said:
You can get that value from the second network request bytes range when you are opening the format context (first network request is made with bytes range 0-* and then the second network request is made with bytes range XXXX-* where XXXX should be the buffer size)
From that and what he says: not the whole video is necessary but the first part of audio only ?

i can fallback to iOS or VLC player but I guess iPhone video over network would often be used on an iOS player

[kingslay]

不是所有的mov都会有这个问题，就iPhone手机拍的才会。我也试着要用range来进行判断。但是无法获取range的信息。所以你可能需要用avplayer来进行播放。我的项目有提供了一个avplayer的实现。

[neckaros]

Letting AVPlayer as the primary player is indeed a good workaround

[kingslay]

这个问题你可以用最新的代码试下，应该不会那么慢了。