Rockbox mail archive
Subject: Re: Video plugin and tools problems/limitations
From: [IDC]Dragon (idc-dragon_at_gmx.de)
> First of all I have to say: excellent work, Jörg!
> Now on topic: As I like the new video-with-audio feature very
> much, I did convert quite a number of videos to rvf and as I
> also like to test extreme cases, I summarize my findings here.
BTW, what's the battery life with video, since you seem to do long runs? I
haven't tried, and for 8MB it's much longer.
> Problems with the tools and the video conversion path:
> - "AVItoYUV" does not read AVIs >= 2 GB (about 1:06h at RGB24
> uncompressed, 112x64, 25fps (PAL)) -> longer films have to
> be split into 2GB packets to convert them to YUV. As YUV
> are only raw frames without header, you can re-join the
> packets after conversion, so this is a minor problem. As
> AVItoYUV is probably not Jörg's development (file date!),
> he may not be able to correct this problem either.
This tool is from Microsoft. I don't have the sourcecode for it.
> - "Halftone" does not read YUVs >= 2 GB (about 2:12h at 25fps
> (PAL)) -> longer films have to be halftoned in 2 GB packets.
> As RVF without audio is also headerless, you can also join
> the packets after conversion, but since the frames in the
> RVF are not independent (halftoning is done across several
> frames!), you see a small glitch at the joint. I tested
> this with "Lord of the Rings 1" (yep!)
I think this can be changed to 4 GB, have to look into it.
> - "RVF_MUX" has problems multiplexing the video with audio
> that uses MPEG2 or MPEG2.5 sample rates (24k-22.05k-16k-12k-
> 11.025k-8k): "Audio sync error in file <MP3file> at
> <position>, possibly corrupted" is displayed multiple (many)
> times, sometimes rvf_mux even hangs. All test MP3s were
> prepared with LAME 3.95, CBR and VBR.
MPEG2 should work. I have not implemented the 2.5 audio formats, but this
can be easily changed.
> Problems with the video.rock:
> The plugin resets ALL audio settings EXCEPT volume to their
> defaults (on the chip, but not in the firmware!) (that is
> 0 dB for treble, bass, loudness; 0% for balance, bass boost;
> stereo channel configuration). You have to enter each setting
> in the sound settings menu and up/down them by one in order
> to get them back or reload the from a .cfg file.
Strange, I only set the volume, because it can be muted when the plugin
starts. The others I don't touch. Maybe there are dependencies, do I have to set
all audio settings? Somebody familiar with that code?
> Again: keep up the good work!
I try. I'm (slowly) working on a one-click tool to convert AVI and MPEG.
This will be Windows-only, since it uses the DirectShow infrastructure. halftone
and rvf_mux are portable.
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Page was last modified "Jan 10 2012" The Rockbox Crew