[Ssc-dev] fine-tuning the ffmpeg build

[Shawn Van Every]

It seems to work.  I haven't done anything more than very basic tests though.

I did check it in to the SSCVideoProto repo.

Please let me know if you are able to get the audio encoding correct with it.  I am using the same two commands that don't do anything with the audio:

>> Super Duper High Quality (probably too high)
>> (audio is already in AAC so it is simply copied but we should nail down the settings there as well)
>> ffmpeg -v 10 -y -i input.mp4 -vcodec libx264 -b 3000k -s 720x480 -r 30 -acodec copy -f mp4 -vf 'redact=redact_unsort.txt' output.mp4
>> 
>> Lower Quality (Didn't get the audio right so using the -an to strip it for now)
>> ffmpeg -v 10 -y -i input.mp4 -vcodec libx264 -b 1000k -s widthxheight -r 15 -vf redact=redact_unsort.txt -an -f mp4 output.mp4




On Sep 28, 2011, at 2:36 PM, Hans-Christoph Steiner wrote:

> 
> Hey Shawn,
> 
> I haven't heard back about the most recent ffmpeg update.  Is it working for you?  I think it would be possible to strip it down further.  Its including quite a bit now.  I think its at 5.7megs.
> 
> .hc
> 
> On Sep 14, 2011, at 11:04 PM, Shawn Van Every wrote:
> 
>> Hey Hans,
>> 
>> Fortunately the latest is 9 mb rather than 27 mb but it could still use some optimizing and trimming.
>> 
>> For the input videos we want it to work with both our app and the built in camera.  In our app we are using the camera defaults anyway so the best thing to do is record a video using the built in camera app at each of the quality settings as the source.
>> 
>> Unfortunately, this won't get us 100% of the way there as it is possible that some devices will support different formats but for now I think we should support what is spit out on the Nexus 1/Nexus S running 2.3 (I assume that is what you are running).
>> 
>> The output isn't completely nailed down but I think we want it to be an MPEG-4 file with H.264 video and AAC audio.  size, bitrate, framerate, sample rate, bit depth and so on should be consistent with the input.  If it is a LOW quality original then use lower quality settings, if it is HIGH then higher quality settings.
>> 
>> Here is what I have right now:
>> 
>> Super Duper High Quality (probably too high)
>> (audio is already in AAC so it is simply copied but we should nail down the settings there as well)
>> ffmpeg -v 10 -y -i input.mp4 -vcodec libx264 -b 3000k -s 720x480 -r 30 -acodec copy -f mp4 -vf 'redact=redact_unsort.txt' output.mp4
>> 
>> Lower Quality (Didn't get the audio right so using the -an to strip it for now)
>> ffmpeg -v 10 -y -i input.mp4 -vcodec libx264 -b 1000k -s widthxheight -r 15 -vf redact=redact_unsort.txt -an -f mp4 output.mp4
>> 
>> -shawn
>> 
>> 
>> On Sep 14, 2011, at 5:10 PM, Hans-Christoph Steiner wrote:
>> 
>>> 
>>> Hey Shawn (and anyone else who's interested),
>>> 
>>> I want to fine-tune the ffmpeg build for SSC so its not 27 megs, uses
>>> faster ARM assembly, etc..  If you could provide me with an example
>>> video file to start from and the flags for the file you want to end up
>>> with, I can nail down a small, optimized ffmpeg for it.
>>> 
>>> I can also work on the resulting format, if that's not already nailed
>>> down.
>>> 
>>> .hc
>>> 
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>> 
>> Shawn Van Every
>> vanevery at walking-productions.com
>> Mobile and Streaming Consulting
>> http://www.walking-productions.com/notslop
>> Author: Pro Android Media: http://amzn.to/eYb48C
>> 
> 
> 
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