regression --video-filter=scene image-types & performance

[Riven]

I wanted to report both a regression in export performance, and a regression in supported image-types when exporting video frames as individual image files. There are the results:

Video specs: 720x480 30fps

VLC 1.1.11
--scene-format=png 19fps
--scene-format=bmp 30fps
--scene-format=jpg Err#1 (shows as 8x8 pixels blocks, probably a MTU decoding issue)
--scene-format=tga 30fps

VLC 2.0.1
--scene-format=png 8fps (halved!)
--scene-format=bmp Err#2 (I depended on this...)
--scene-format=jpg Err#3 (shows as 8x8 pixels blocks, probably a MTU decoding issue)
--scene-format=tga 30fps (... so I had to switch to TGA, which seems to be the only format that performs well)


All these errors are outputted per frame:


Error 1
rc buffer underflow

Error 2
[bmp @ 04d324c0] Error getting output packet.

Error 3
VLC probably does not support this image format.
[mjpeg @ 047617e0] Either both buffer size and max rate or neither must be specified
[0476f3e0] avcodec encoder error: cannot open encoder
[0476f3e0] main encoder error: Streaming / Transcoding failed
[0476f3e0] main encoder error: VLC could not open the encoder.
[0476f3e0] main encoder error: no suitable encoder module for fourcc `jpeg'.




The dump directory is on a ramdisk, so disk I/O is not the bottleneck.


I realize that the provided info is minimalistic. If more information is required, please let me know!