[Ssc-dev] fine-tuning the ffmpeg build

[Shawn Van Every]

Unfortunately MP4 containers with mp3 audio tracks aren't well supported by playback applications (such as QuickTime) and I don't think explicitly supported on android by the media player.  I would very much like us to output MP4 with AAC which is well supported.

Hans-Christoph Steiner <hans at at.or.at> wrote:

>
>Do we need to use AAC as the audio codec?  Its not well supported in  
>ffmpeg internally, so it would require an external lib, faad or faac,  
>I think.  How about mp3?  That should work fine in ffmpeg and in mp4  
>files.  Or why not just always do -acodec copy?
>
>.hc
>
>On Sep 28, 2011, at 2:42 PM, Shawn Van Every wrote:
>
>> 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
>>>>
>>>
>>>
>>> ----------------------------------------------------------------------------
>>>
>>> “We must become the change we want to see. - Mahatma Gandhi
>>>
>>
>>
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