Differences

This shows you the differences between two versions of the page.

--- doc:appunti:linux:video:ffmpeg [2023/01/07 14:51] – [Final rendering (re-encoding)] niccolo
+++ doc:appunti:linux:video:ffmpeg [2023/01/07 15:21] – [AVC (x264) is better than ASP (xvid4)] niccolo
@@ Line 271: / Line 271: @@
 ^ Video filter    | swresize, 1366x768, Bilinear  |
 ^ Basic x264      | Preset: **slow** (or less), Tuning: **film**, Profile: **High**, IDC Level: **Auto** |
-^ Video encoding  | Average Bitrate (Two Pass), Average Bitrate 6000 kb/s (about 3 Gb per hour)  |
+^ Video encoding  | Average Bitrate (Two Pass), Average Bitrate 4096 kb/s (about 1.8 Gb per hour)  |
 ^ Audio codec     | <del>Lame MP3</del> Vorbis  |
 ^ Audio bitrate   | CBR 192 (or higher)  |
-We can use **Avidemux** to make the final rendering (re-encoding). For a **comman line only** solution you can consider ffmpeg to perfomr the re-encoding and **mkvmerge** (contained into the **mkvtoolnix** Debian package) to merge all into a Matroska container.
+We can use **Avidemux** to make the final rendering (re-encoding). For a **command line only** solution you can consider **ffmpeg** to perfomr the re-encoding and to make the merge (mux) all into a Matroska container.
+<code bash>
+#!/bin/sh
+TITLE="Balcani, maggio 2022"
+ffmpeg \
+    -i "video-high-quality.mkv" \
+    -i 'audio-music.ogg' -i 'audio-live.ogg' \
+    -map '0:v:0' -map '1:a:0' -map '2:a:0' \
+    -metadata title="$TITLE" -metadata:s:v:0 title="$TITLE" \
+    -metadata:s:a:0 title="Accompagnamento musicale" \
+    -metadata:s:a:1 title="Audio in presa diretta" \
+    -filter:v "scale=1366x768" -aspect "16:9" \
+    -vcodec 'libx264' -pix_fmt 'yuvj420p' -preset 'veryslow' -tune 'film' -profile:v 'high' -level:v 5 \
+    -acodec copy \
+    "2022-05_balcani.mkv"
+</code>
 ====== Re-encoding with tonal correction ======
@@ Line 309: / Line 326: @@
 The gamma correction for the three RGB channels was determined with the GIMP, using the //Colors// => //Levels// => //Pick the gray point for all channels// tool. The use of MPEG-TS clips allowed the montage of the final video by just concatenating them.
-==== AVC (x264) is better than ASP (xvid4) ====
+===== AVC (x264) is better than ASP (xvid4) =====
 See this page: **[[https://www.avidemux.org/admWiki/doku.php?id=general:common_myths|Common myths]]** to understand the differences between formats (standards) and codecs (pieces of software). Read also this simple page: **[[https://www.cyberlink.com/support/product-faq-content.do?id=1901|Difference between MPEG-4 AVC and MPEG-4 ASP]]**. See also the Wikipedia article about **[[wp>Advanced Video Coding]]**.