tresvecesseis
commented
8 years ago we have also reported this weird behaviour before, it appears to be related to the presence of IDR keyframes, by default the player discards al the frames (but not the corresponding audio) until it finds an IDR keyframe then it displays the IDR keyframe and plays all the buffered audio until it reaches the point in time of the displayed keyframe, then the video resumes normally, with the allowNonIdrKeyframes option the interval until a keyframe is found is reduced (in our case we go from 30 seconds to less than a second) but we think that the right solution is to discard all the audio buffers prior to the keyframe timestamp.
On Wed, Apr 6, 2016 at 1:58 AM, Yuriy Chernyshov notifications@github.com wrote:
Dear colleagues, Another issue discovered and this time I am ready to provide channel manifest link :-) Actual result is next: When start to play provided live channel, audio track plays ahead of video one for a several seconds (depends on device, could be 5, or 10, or whatever) while first frame of the video is displaying. Then both channels starts to play synchronously. Interesting thing is that video starts to play synch with audio without blinking. From user perspective it seems like video waits for the audio. More interesting, if I disable audio track from the code in DemoPlayer.java (in constructor): player.setSelectedTrack(TYPE_AUDIO, TRACK_DISABLED); then video freezes on the first frame and never resumes. As soon as audio track enables, video starts to play synch with audio. This behaviour was detected on our application and reproduced on the ExoPlayer application. Live channel manifest url is:
http://s91.acdn.quickplay.com/live/ss/9990/s/livech92048/livech92048.isml/manifest.mpd Content is MPEGDASH, not protected.
It could be content (or server environment) issue as well, the reason to assume this is that there is the same channel available in our different server but Widevine protected and it plays well just right from the start. It is hard for me to determine exact root cause and I am asking for your assistance.
Thank you in advance.
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ojw28
Dear colleagues, Another issue discovered and this time I am ready to provide channel manifest link :-) Actual result is next: When start to play provided live channel, audio track plays ahead of video one for a several seconds (depends on device, could be 5, or 10, or whatever) while first frame of the video is displaying. Then both channels starts to play synchronously. Interesting thing is that video starts to play synch with audio without blinking. From user perspective it seems like video waits for the audio. More interesting, if I disable audio track from the code in
DemoPlayer.java(in constructor):player.setSelectedTrack(TYPE_AUDIO, TRACK_DISABLED);then video freezes on the first frame and never resumes. As soon as audio track enables, video starts to play synch with audio. This behaviour was detected on our application and reproduced on the ExoPlayer application. Live channel manifest url is:http://s91.acdn.quickplay.com/live/ss/9990/s/livech92048/livech92048.isml/manifest.mpdContent is MPEGDASH, not protected.It could be content (or server environment) issue as well, the reason to assume this is that there is the same channel available in our different server but Widevine protected and it plays well just right from the start. It is hard for me to determine exact root cause and I am asking for your assistance.
Thank you in advance.