[Libav-user] Using LibX264 with ffmpeg libraries

[noahzarc]

Nicolas George-2 wrote
> 
> Le sextidi 6 thermidor, an CCXX, noahzarc a écrit :
>> Apologies for top posting, it's my very first time using a mailing list.
> 
> No problem, you fixed it.
> 
>> Apologies, it's my very first time using a mailing list. Would this be
>> the
>> correct way of setting priv_data?
>> 
>> AVDictionary *outputDictionary;
>> av_dict_set(&outputDictionary, "crf", "0", AV_DICT_APPEND);
>> avcodec_open2(outputCodecCtx, codec, &outputDictionary);
> 
> You would probably make sure you init outputDictionary to NULL before
> doing
> anything on it. And AV_DICT_APPEND is not necessary here and may be
> harmful
> under some circumstances, but yes, this is the gist of it.
> 
> Regards,
> 
> -- 
>   Nicolas GEorge
> 
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> Libav-user@
> http://ffmpeg.org/mailman/listinfo/libav-user
> 

Yeah so I tried to implement this into my code, it works but some thing
weird happens when I change the value of crf.. So originally I have crf set
at 0, which produces lossless output. But since the output file size is too
big, I wanted to change crf to a higher value, let's say 18. But if I do
that, the output video file generated would be 6KB without any content in
it. Any ideas why/how this happened?

Thanks!
Cheers



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