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Re: differo neo
Iniciado por grey
Según he leido por ahi depende del formato de perfil: http://es.wikipedia.org/wiki/H.264/MPEG-4_AVC
"I write this entry to have myself informed better about video encoding and get knowlegde about possiblities to find solutions getting things to work if hardware is not capable of doing due to limitations.
One of the major reasons of getting the artefacts are the amount of reference frames used in: I frame, P frame and B frame.
When we check WikiPedia for information about why we should use L4.1 or L5.1 than we can read that L5.1 should be used for high bitrates only. Even HDDVD and Blueray are encoded on L4.1 level
Although L5.1 is supported by the Sigma 8635 (recuerdo que el nuestro es el 8623) up to a certain extend, there will still be some clips with artefacts when playing the L5.1 profile (por esto no lo lee el Dvico 6500 ni supongo que casi nadie).
Sigma Designs does not support L5.1 for their chipset. If they would say so, than they have to ensure 100% compatibility, including the ‘very’ high bitrates. The higher the bitrate, the more memory/processor power (and more) is needed to decode it. And even if we could extend memory still we would see clips with artefacts (if the bitrate would be high up to a certain level.
So if you want to ensure yourself with correct playable media you have to use these max. number of frames:
1280×720@68.3 (9), 1920×1088@30.1 (4), 2048×1024@30.0 (4) L4.1 (Source: Wikipedia)
You will not get better quality when using more stored frames when the resolution, bitrates and framerates are within the level 4.1. Even it is not understandable why some encoders / people within the ’scene’ are using L5.1 encoding when video bitrates are <25 Mb/s. What for use has it? Even if the original source is L4.1 it has no use to bring it to Level 5.1 and I’ve barely seen people using high bitrated uncompressed masters for encoding.
A valid question could be: how to play the L5.1 encoded clip without artefacts.
My answer: the easiest way is to remux the file to a TS or a M2TS stream.
Another simple tool for users like me could be: RIPBOT264. This tool was working fine when remuxing a 150MB MKV L5.1 clip I used for testing. This tool can remux the L5.1 file to L4.1 with correct reference frames, keep the audio as it is and put it all back in the MKV… (no idea about subtitles though)."
Por si sirve de ayuda (no recuerdo la fuente)... No tengo mucho tiempo pero seguiré investigando...
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