[aklug] Re: Converting ogv to mp4

Hmm... I'll play around with the settings again. Might be stuck with
the jumbo sized file.

Sent from my iPhone

On Apr 20, 2010, at 10:02 PM, Shane Spencer <shane@bogomip.com> wrote:

> It depends on how the frames were set up. For a screencast
> theora/h.264/mpeg/flv/gif will work pretty well if you assume you need
> very few intermediate frames. Since you used a screen recorder
> chances are the theora stream was encoded with that in mind.
> Converting it may have introduced more full frames.
>
> I'm guessing media delivery is done using using TCP for the final
> stream.. Try converting it with ffmpeg and control how often full
> frame updates are made.
>
> Also, you may end up tricking the other codec and causing a larger
> output by not smoothing the original input to remove the visual
> boundary on all motion blocks. This is important if you're encoding
> to a "natural" codec like h.264 since it would really really like to
> not have to encode straight lines left behind from one block size into
> a stream that uses a different block size. If the original source
> looks fine then this may not be the case.. but I've seen some
> transcoding from low bitrate mpeg4 to other formats get larger in some
> areas of the stream due to this.
>
> - Shane
>
> On Tue, Apr 20, 2010 at 10:22 AM, damien hull
> <damien@linuxninjas.tv> wrote:
>> I'm trying to do a screen cast. I used record my desktop to capture
>> the screencast. That saves it in ogv format. That's the open source
>> ogg theora format. The file size was something like 160 megabytes
>> or something like that. I used the video editor kdenlive to convert
>> the video into an h264 encoded mp4 video file at 8000k. I think
>> that 800k is the bit rate. Anyway, the file size was something like
>> 240 megabytes.
>>
>> Why is the mp4 video file larger then the ogv file? Shouldn't it be
>> going down in size? I must be missing something here.
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Received on Thu Apr 22 17:12:48 2010