New submission from Stephan Sokolow <ffmpeg.ssoko...@spamgourmet.com>:
The RealVideo 2.0 (RV20) codec is fragile in ways which render some of the clips in the early the Royal Canadian Air Farce online video clip archive (Starting with Season 12, they switched to RealVideo 4.0) unwatchable. Specifically, they encounter an error of some sort which causes the video output to shrink and garble and, once that's happened, the only way to regain video is to stop and restart playback and then seek to past the error. Here's one example file which trips up the ffmpeg codec at 8 seconds in: http://airfarce.com/video/000211fh.rm (ffplay output attached as requested) I've tested with the same results on ffplay (0.4.9_p20090201 and SVN HEAD (r17100 as of this posting)) and MPlayer (SVN-r28450 from the Gentoo ebuild). Not all files cause visible problems, but a significant number do. Also, even the ones with no visible problems usually generate a flurry of "[rv20 @ 0xbe4560]unknown bit3 set" messages at some point during playback. (As far as I can tell, the "@ 0xbe4560" part stays unchanged both within and between all files I've tested) Keep in mind that some of the troublesome files also break on current RealPlayer in the same way (though usually in different places) but I can confirm that CD-R stored copies which mess up on current RealPlayer worked fine on the Windows RealPlayer of the time back when I burned them. (RealPlayer G2, if I remember correctly) The first example video trips up RealPlayer 11 at a very different point (at least a minute in) and here's one which trips up both ffmpeg and RealPlayer 11 in the same place: http://airfarce.com/video/earleh.rm For more test clips, you can visit http://airfarce.com/video/index.html (their old video hub was kept intact for posterity) and click on any episode title annotated with the "Watch the Video On-Line" eye. (Basically, everything in seasons 7 through 11) ---------- messages: 4212 priority: normal status: new substatus: new title: rv20 video garbles part-way through provided example clips type: bug ____________________________________________________ FFmpeg issue tracker <ffmpeg_iss...@live.polito.it> <https://roundup.ffmpeg.org/roundup/ffmpeg/issue833> ____________________________________________________
