Andrea provided corrections

[goodguy/cin-manual-latex.git] / parts / Quickstart.tex

diff --git a/parts/Quickstart.tex b/parts/Quickstart.tex
index aaefc14e2f8d54955e60acb9a2e916e0068979b8..8d65f2b0f5cdd1800580b7580dd6e8834ef2e152 100644 (file)
--- a/parts/Quickstart.tex
+++ b/parts/Quickstart.tex
@@ -282,10 +282,9 @@ The file you created in the Render step should now be playable.  You can test th
 \index{format}
 \index{codec}
 
 \index{format}
 \index{codec}
 

-

 Here is an overview of the formats (also called containers) and codecs that are used in \CGG{}, by ffmpeg and the internal engine. Roughly speaking these are divided into uncompressed codecs (or codecs with \textit{Intraframe} compression, which can be lossy or lossless) and compressed codecs of \textit{Interframe} type (LongGOP, almost always with lossy compression). The All-I (intraframe) codecs are suitable for editing because a cut or other operation on the timeline corresponds to the exact frame on which you are operating. The interframe types use Groups of Pictures (GOP) and a cut or other operation is accurate (and requires no further calculation) only if it coincides with the beginning of the GOP, and not with an internal frame. There is also color compression: Color Space \textit{bit-depth} and \textit{Chroma-Subsampling} for YUV models. In addition, heavy compression requires the system to do more encoding/decoding work on the timeline. High quality codecs have high bit rates and bit depths but this also affects the performance of the system, not to mention the increased disk space usage. Some formats implement both audio and video streams, others audio only or video only.  
 
 Here is an overview of the formats (also called containers) and codecs that are used in \CGG{}, by ffmpeg and the internal engine. Roughly speaking these are divided into uncompressed codecs (or codecs with \textit{Intraframe} compression, which can be lossy or lossless) and compressed codecs of \textit{Interframe} type (LongGOP, almost always with lossy compression). The All-I (intraframe) codecs are suitable for editing because a cut or other operation on the timeline corresponds to the exact frame on which you are operating. The interframe types use Groups of Pictures (GOP) and a cut or other operation is accurate (and requires no further calculation) only if it coincides with the beginning of the GOP, and not with an internal frame. There is also color compression: Color Space \textit{bit-depth} and \textit{Chroma-Subsampling} for YUV models. In addition, heavy compression requires the system to do more encoding/decoding work on the timeline. High quality codecs have high bit rates and bit depths but this also affects the performance of the system, not to mention the increased disk space usage. Some formats implement both audio and video streams, others audio only or video only.  
 

-\subsection{FFmpeg Video Formats}%
+\subsection{Video FFmpeg Formats}%

 \label{sec:FFmpeg_video}
 
 FFmpeg supports hundreds of codecs and formats. Some are proprietary and cannot be implemented in FFmpeg or can be voluntarily compiled as non-free; others are proprietary but their use is free; finally there are the Open formats/codecs, fully supported and well documented. We are only describing here a selection of the most well-known and most frequently used ones.
 \label{sec:FFmpeg_video}
 
 FFmpeg supports hundreds of codecs and formats. Some are proprietary and cannot be implemented in FFmpeg or can be voluntarily compiled as non-free; others are proprietary but their use is free; finally there are the Open formats/codecs, fully supported and well documented. We are only describing here a selection of the most well-known and most frequently used ones.


@@ -329,7 +328,7 @@ These are also called Delivery codecs. They are the most used and widespread bei
        \item[MP4] The most popular. Many other formats belong to this family (MPEG);
        \newline    h264 is actually x264, open, highly configurable and documented; h265/HEVC is actually x265, open, highly configurable and documented. x264-5 is for encoding only.
        \newline Presets: \textit{h265, h265, mjpeg, mpeg2, obs2youtube}
        \item[MP4] The most popular. Many other formats belong to this family (MPEG);
        \newline    h264 is actually x264, open, highly configurable and documented; h265/HEVC is actually x265, open, highly configurable and documented. x264-5 is for encoding only.
        \newline Presets: \textit{h265, h265, mjpeg, mpeg2, obs2youtube}

-       \item[WEBM] Open; similar to mp4 but not as widespread (it is used by YouTube). In \CGG{} there are specific Presets with \texttt{.youtube} extension, but they are still webm.
+       \item[WEBM] Open; similar to mp4 but not as widespread (it is used by YouTube). It belongs to the Matroska family. In \CGG{} there are specific Presets with \texttt{.youtube} extension, but they are still webm.

        \newline Presets:  \textit{VP8, VP9, AV1}
        \item[MKV] Open, highly configurable and widely documented. It might have seeking problems. It belongs to the Matroska family.
        \newline Presets:  \textit{Theora, VP8, VP9}
        \newline Presets:  \textit{VP8, VP9, AV1}
        \item[MKV] Open, highly configurable and widely documented. It might have seeking problems. It belongs to the Matroska family.
        \newline Presets:  \textit{Theora, VP8, VP9}


@@ -366,7 +365,7 @@ Some formats, though used in the past in the pro field, are disappearing with th
        \newline    Presets: \textit{mjpeg}
 \end{description}
 
        \newline    Presets: \textit{mjpeg}
 \end{description}
 

-\subsection{FFmpeg Audio Formats}%
+\subsection{Audio FFmpeg Formats}%

 \label{sub:FFmpeg_audio}
 
 Audio formats and codecs take much less resources and space than video ones, so they are often used without compression for maximum quality. However these are compressed formats and codecs widely used in streaming and sharing.
 \label{sub:FFmpeg_audio}
 
 Audio formats and codecs take much less resources and space than video ones, so they are often used without compression for maximum quality. However these are compressed formats and codecs widely used in streaming and sharing.