Michael Rampe
Forum Replies Created
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[Grischa Stanjek] “Unfortunately the playback is not smooth. It’s delayed and interrupting every few seconds… I also get a buffer underflow.”
Have you tried different bitrates?
Have you tried different codecs?
Have you tried different framerates?Buffer underflow means there is too much information, ie. cannot be encoded.
I would try to specify a [higher] bitrate or -qmax instead of using -sameq as this might fix your buffering problem.
Michael
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[Brandon Tate] ” I’d like the video to not change size unless it is larger than the given max width/height. Is that possible via command line?”
Yes but not in a single command. I have a script that does this by doing an input analysis to identify the size, running some very simple logic to determine if it is larger than what is required and setting/using variables to write the FFmpeg command size options based on the results of the logic.
[Brandon Tate] ” I’d like to maintain the aspect ratio.”
Display aspect ratio or pixel aspect ratio?
Michael
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[steve oregon] “No luck with that, thanks anyway!”
Another thing to try is static libraries instead of shared.
use –disable-shared in your configure instead of –enable-shared and try –enable-static as well.
This will not apply to your third party libraries but will build the core Libav* libraries as static.
Michael
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[Lex Frost] “WARNING: library configuration mismatch”
[Lex Frost] “[swscaler @ 0x865a330] bad src image pointers”
Looks like an installation error. try to clean and remake FFmpeg.
Michael
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[Stan Juznitok] “I was wondering about the meaning of drop and dup at the output of ffmpeg? What is their meaning?”
“Drop” means it has dropped a frame during encoding.
“Dup” means it has duplicated a frame during encoding.
Michael
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[Rahul Mehta] “I want to take screen shot of size of the video. How can if take it , as now i can take the screen shot of this size like 120×90 by following code.”
Not sure of the question here. Do you want the size to be the same as the original? If so, just remove the -s flag and FFmpeg will use the source size.
Michael
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[steve oregon] “A friend asked me to install ffmpeg on his server, the problem is he already tried to install ffmpeg many times, from a few rpm repos, compiling from source, etc.. the result, a big mess, with lot of problems.”
No experience with the OS in question but….
Did you do “make clean distclean” before you reinstalled?
This should remove all files made by make and ./configure to reinstall from scratch.
Michael
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Have a look at this thread from recently.
https://forums.creativecow.net/thread/291/247#251
Let me know if that answers your question.
Michael
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[Kit Carrau] “Which means I should be able to convert to webm? However when I run
“ffmpeg -i [input.mp4] [output.webm]”, I get the following error:“Encoder (codec id 146) not found for output stream #0.0″”
Have you tried specifying the codec rather than relying on FFmpeg choosing based on output container?
Example: -vcodec libvpx -b 1500k
Michael
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Try sox.