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Questions about transcoding settings

Added by Sylvain Cecchetto over 9 years ago

Hello,

First of all congratulation to the Dev team ! This soft it's just wonderful.

I use it with transoding option (I am in France and my french girlfriend studies in Belgium, with Kodi (belgium) and TVheadend/transcode (france) she can watch French's TNT TV channels through internet).

But i Would like to best configure the transcode option to get the best ration quality/bitrates/"bug".

I searched with google but :
- What's the difference between built-in and av-lib for the container choice ?
- Is that the couple of container/video codec is important ? (WEBM/VP8? or MKV/VP8?).
- Others informations about the choice of the video codec ... ?

Thanks you all

PS : At this time I use MKV av-lib with VP8 and mp2 for audio. It is a good choice ?

And sorry for my bad english. I hope my question is understandable


Replies (4)

RE: Questions about transcoding settings - Added by saen acro over 9 years ago

All depending of "PC Power"
there is a lot of mpeg4 calculators
but it is important to test in real situation

http://www.dr-lex.be/info-stuff/videocalc.html

RE: Questions about transcoding settings - Added by Sylvain Cecchetto over 9 years ago

Thanks you Saen,

And what about the built-in / av-lib difference ?

RE: Questions about transcoding settings - Added by S. Benz over 9 years ago

I don't know, why there are built-in and av-lib containers. When using built-in, it means that the containers are created by tvheadends own muxer, when using av-lib, the containers are created with the help of the libav/ffmpeg library. The result should be the same, so if you don't have problems, you don't have to worry.

For video, libx264 should produce the best quality, but it's also the most CPU demanding of the three. VP8 is special, because it uses as much CPU as it can get, so the faster your CPU, the better the VP8 quality. MPEG2 should only be used, if the player doesn't support the other two codecs, as it has the worst compression ratio.

For audio, AAC and Vorbis probably have the best compression, MP2 is (just as MPEG2 video) only for players, that don't support the other codecs. For Vorbis, make sure to select "libvorbis" instead of "vorbis" if both are available, as "libvorbis" is the better one.

For container, MKV and WEBM are essentially the same format. The difference is, that WEBM restricts, what codecs can be used. Of the codecs available in tvheadend, only VP8 and Vorbis are allowed in WEBM, while MKV allows all codecs.

So, if your tvheadend server is fast enough, I'd recommend a combination of libx264/libvorbis/MKV or libx264/aac/MKV.

RE: Questions about transcoding settings - Added by Sylvain Cecchetto over 9 years ago

Thanks you very much S. Benz for your answer. Very clear for me now !!

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