Changes between Version 6 and Version 7 of Encodings

Timestamp:

03/16/13 04:25:53 (9 years ago)

Author:

Antoine Martin

Comment:

typos

Encodings

@@ -33 +33 @@
 === Profiles ===
 (see [http://en.wikipedia.org/wiki/H.264/MPEG-4_AVC#Profiles wikipedia h264 profiles])
-x264 supports the following profiles: {{{baseline}}}, {{{main}}}, {{{high}}}, {{{high10}}}, {{{high422}}} and {{{high444}}}
+x264 supports the following profiles: {{{baseline}}}, {{{main}}}, {{{high}}}, {{{high10}}}, {{{high422}}} and {{{high444}}}.
+
 At present, we use {{{high}}} or better by default unless the client overrides it.
 
@@ -39 +40 @@
 === Quality Option ===
 What this does should be obvious (in x264 speak, this controls the {{{rc.f_rf_constant}}} parameter), but it is more complicated than you think:
-* we support 3 different colourspace modes: YUV420, YUV422 and YUV444 and this affects the quality of the picture too. (YUV420 is used for lowest quality settings). {{{YUV444}}} uses roughly twice as much bandwidth as {{{YUB420}}}. Switching from one mode to another is expensive, as we then need to send a new key frame and re-initialize both the encoder and the decoder - so the thresholds for going up to the next mode are not the same as the thresholds for going down to the next mode (prevents a yoyo effect).
+* we support 3 different colourspace modes: YUV420, YUV422 and YUV444 and this affects the quality of the picture too. (YUV420 is used for lowest quality settings). {{{YUV444}}} uses roughly twice as much bandwidth as {{{YUV420}}}. Switching from one mode to another is expensive, as we then need to send a new key frame and re-initialize both the encoder and the decoder - so the thresholds for going up to the next mode are not the same as the thresholds for going down to the next mode (prevents a yoyo effect).
 * not all modes are supported by all profiles, so we need to switch to a different profile to support {{{YUV422}}} ({{{high422}}} or {{{high444}}}) and {{{YUV444}}} ({{{high444}}} only).
 * some builds against older versions of libav/ffmpeg only support {{{YUV420}}},