Frame-by-frame feature needs hardening (v1.0.1)

[blackthorne16]

Dear developers,

the frame-by-frame feature works well - if you use it *tenderly* and *carefully*!
At the hands of callous guys like me, it needs a little bit more resilience. A crash of VLC can be reproduced as follows (tested it with WMV, XVID, H.264/MKV):

1. Pause at the desired position in your video file. Sometimes VLC crashes just by pressing the frame-by-frame button several times quickly.
2. If not already crashed, go to another position by using the slider (still in pause mode). After a few clicks of the frame-by-frame button VLC is sure to crash.

Note: Some of the interface seems to respond, but when you close VLC, there is still a VLC process in the Task Manager running (not CPU-consuming, about 5-10%).

Feature request: any chance you could program a "frame-by-frame backwards"? Would be perfect.

[VLC_help]

Feature request: any chance you could program a "frame-by-frame backwards"? Would be perfect.

Nope. This isn't possible with all streaming setups and in some cases (lots of P and B frames) it would be way too slow to be useful.

Frame-by-frame crash is known issue.
https://trac.videolan.org/vlc/ticket/2951

[Atalanttore]

Feature request: any chance you could program a "frame-by-frame backwards"? Would be perfect.

Nope. This isn't possible with all streaming setups and in some cases (lots of P and B frames) it would be way too slow to be useful.

Would it be possible as Undo function for the normal frame-by-frame? A "frame-by-frame backwards" button that appears after you have used the normal frame-by-frame button and disappears again when reaching the frame-by-frame starting point. The previous frame-by-frame pictures might be in the cache so that no video decoding is necessary.

Regards,
Ettore Atalan

[Rémi Denis-Courmont]

In principles, it would be possible. But it would require a lot of extra code for the picture buffer pool to keep track of past and not yet reused picture buffers. But in practice, you would typically be able to rewind one or two frames only.

And it would be very difficult for users to comprehend why they can rewind sometimes one or two frames, sometimes none at all.