> > From: Luca Barbato <[email protected]> > > If you use flowplayer or you just load it what happens?
Didn't get a chance to try this unfortunately, but I ended up re-encoding the files with the "-movflags frag_keyframe" option and the progressive-download playback problems went away. It's a bit odd because the container is MP4 and not MOV, and I understand this option to be more relating to video but evidently something in the code path is making a difference... > > > Again, this only seems to happen with files encoded by avconv in MP4 > > container format, regardless of AAC codec chosen. The Nero AAC encoded > > files work perfectly in any command line player or the Flash-based web > > players. > > According to 14496-1:2010 7.2.6.6 DecoderConfigDescriptor: > avgBitrate ? is the average bitrate in bits per second of this > elementary stream. For streams with variable bitrate this value > shall be set to zero. > > (thanks to our mp4 experts) > > So either flash is out of specification or there is something with the > specific player... (or the interpretation of the paragraph could be > different) Well, I'm encoding these with "-b:a 96000" and I would expect constant bitrate to be used, so this makes no sense on two levels. Given what I discovered above with the keyframe fragment option, the average bitrate metadata seems to be a red herring, but even obeying the standard, avconv should be setting a constant bitrate and expressing that bitrate in the metadata. The second point I would make is that an "average" bitrate value only makes sense in the case of something that varies - a constant bitrate has no need of an average, but I guess that's something we can blame the specification authors for. _______________________________________________ libav-tools mailing list [email protected] https://lists.libav.org/mailman/listinfo/libav-tools
