Re: Read frame by frame mp4 file, need exampl e.

Thank you so much, I made it working. Main steps following:
 var appSink = new AppSink("my_appsink");
 appSink["sync"] = true; // what this setting do, btw?
pipeline.SetState(State.Playing); // most important setting, not paused state
 
 while (_doLoop)
            {
             
                var sample = appSink.PullSample();
                _doLoop = TrySaveSampleToFile(sample,counter);
                counter++;
                var result = pipeline.QueryPosition(Format.Buffers, out var pos);
                result = pipeline.QueryPosition(Format.Bytes, out var bts);
                result = pipeline.QueryPosition(Format.Time, out var time);
                result = pipeline.QueryPosition(Format.Default, out var def);
                System.Diagnostics.Debug.WriteLine($"[cnt={counter}]  time = {time}, pos = {pos}, def ={def}, bytes = {bts}");
             }
 
 
Few questions remaining:
1)what is appSink["sync"] actually means?
2)
[cnt=1]  time = 4189794700, pos = -1, def =0, bytes = -1
===NEW STEP EVENT RAISE=====
[cnt=2]  time = 4460944600, pos = -1, def =0, bytes = -1
===NEW STEP EVENT RAISE=====
[cnt=3]  time = 4750251000, pos = -1, def =0, bytes = -1
===NEW STEP EVENT RAISE=====
[cnt=4]  time = 5028356600, pos = -1, def =0, bytes = -1
 
Why in query code above only time varies?
 
Again, thank you very much ,  Mathieu!