FFmpeg vs. Libav - And many other questions

seasons · 03-31-2015, 08:00 PM

I'll say it again: try vp8
https://en.wikipedia.org/wiki/WebM

wh33t · 03-31-2015, 10:06 PM

Quote:

Originally Posted by seasons

I'll say it again: try vp8
https://en.wikipedia.org/wiki/WebM

Code:

avconv -i input.mp4 -s hd720 -acodec libvorbis -q:a 3 -vcodec -q:v 10 libtheora -f ogv output.ogv

That sounds great. How I would modify this command to use vp8, should I also be using that OPUS audio codec? I just want decent looking video that streams well and is widely supported and minimal storage requirements.

maples · 04-01-2015, 06:50 AM

If you're aiming for a certian file size, I've heard of the "-fs" option which sets the target output size.

http://www.linuxquestions.org/questi...1/#post5338529

As for encoding using VP8/Webm, try

Code:

avconv -i input.mp4 -s hd720  output.webm

wh33t · 04-01-2015, 09:12 PM

Quote:

Originally Posted by maples

If you're aiming for a certian file size, I've heard of the "-fs" option which sets the target output size.

http://www.linuxquestions.org/questi...1/#post5338529

As for encoding using VP8/Webm, try

Code:

avconv -i input.mp4 -s hd720  output.webm

I did that, it made a 4mb file for 17 seconds of video which looked terrible. I'll try again with q:v - 10 to see if that ups the quality. In the mean time I have another issue.

While transcoding one specific video I get this:

Code:

missing picture in access unit=       3kB time=0.62 bitrate=  44.2kbits/s
[h264 @ 0x23dba00] missing picture in access unit
    Last message repeated 2 times

I'm assuming it means that the computer producing the video had some cpu lag or something. At any rate, is there a way to suppress this error message as it breaks a PHP script I wrote to run the command.