ffmpeg2theora

Cortado seeks incorrectly on video

Asked by Harry Keller

System: Mac OS X 10.6.8
Player: Cortado-0.6.0
Using ffmpeg2theora 0.27

Also using QuickTime Theora plug-in from Xiph.

When creating .ogg files with QT, can set quality, key frame interval, and bit rate. Using Cortado applet to play, the QT-created files work properly whether key frame interval is 1 or 10 or reasonable value smaller than length of video.

When creating .ogv files with ffmpeg2theora, doSeek fails to seek to the correct location whether key frame interval is 1 or 10 or whatever. I've tried many different parameter combinations from simple to complex.

For example, ffmpeg2theora -v 10 --optimize --speedlevel 0 -x 480 -y 360 --aspect '4:3' --title 'bike' bike.mov
Another: ffmpeg2theora --noaudio -v 10 --optimize --speedlevel 0 -V 1500 -K 1 -d 60 --soft-target --two-pass ' --title 'walk' walk.mov

With debug level set to 2, I get from both transcodings a warning message when I seek:
    [WARN] ogg: pageout gave -1

Question is: Is this a ffmpeg2theora bug or have I just not found the correct combination of command-line parameters?

Question information

Language:
English Edit question
Status:
Solved
For:
ffmpeg2theora Edit question
Assignee:
No assignee Edit question
Solved by:
Harry Keller
Solved:
Last query:
Last reply:
Revision history for this message
Harry Keller (harry-4) said : 		#1

More investigation reveals that the QT versions work well only for key frame intervals of 1 and 2. With 3, it's a bit off. The real problem seems to be in Cortado.

Revision history for this message
Harry Keller (harry-4) said : 		#2

While there are differences between the encoding provided by QT and ffmpeg2theora, I cannot say that ffmpeg2theora is at fault.

This problem definitely resides in Cortado.

Revision history for this message
hdj dg (ery4443) said : 		#3

The CD I downloaded for Fluxbuntu will now not boot any computer at paintings or at home. I won't even attempt to determine it out, I've got too much on my arms. I'll try to stay with Xubuntu on the "trash computer". You can see more data here https://bikerwhizz.com/