[x264-devel] Problem With Dropped Frames

[Ralph Brettschneider]

Hello x264-devel,


I would like to report a problem with recent releases of x264..

The newest revisions of x264 are dropping frames during encoding.

Sometime after the release of version 1583, newer releases of x264 have started dropping video frames while encoding movie files. By careful experimentation, I've determined that the source of the dropped frames is x264 rather than some other source. The drop rate is about 4 to 9 frames for a movie file of 150,000 - 200,000 frames. This results is a loss of audio to video synchronization toward the end of the movie.

I've been using x264 for over a year and have used it to encode over 200 movies without any dropped frames issue up to and including v1583. My experiments with v1583 for 5 different movies showed 0 dropped frames for all 5.

I can't give you a version number for when the problem started and I have purged by system of all copies of x264 of versions later than v1583 to prevent using them accidentally. But a x264 download around July 18 had the problem.

My computer system is top line, (4 core, 3.4 gig., 8 gig. ram) with nothing else running during encodes. 

 -----------------------------------
The x264 script lines I use are: 

x264 --pass 1 --bitrate 500 -o MOVIE1.mp4 MOVIE-A1.avs
x264 --pass 2 --bitrate 500 -o MOVIEX.mp4 MOVIE-A2.avs
-----------------------------------
Example avisynth script lines I use are:

LoadPlugin("MPEG2DEC3.dll")
LoadPlugin("MPEGDecoder.dll")
LoadPlugin("TIVTC.dll")

MPEGSource("MOVIE.m2v")
mpeg2source("MOVIE.d2v")


trim(0, 145,264)

tfm()

tdecimate()

ColorYUV(cont_y=35, gamma_y=70)

BilinearResize(704, 368, 8, 56, -8, -60)
-----------------------------------

Until now, x264 has been getting better and better with each new release. I hope this issue can be addressed so I can contine taking advantage of all improvements without having to continue using only v1583 for the future.

Best regards, 

Ralph Brettschneider
ralph at brettschneider.us
2010-07-23
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