From a0f56e907b1492a7535a64bd4166e1d6ed2cca87 Mon Sep 17 00:00:00 2001 From: Kieran O'Leary Date: Sun, 10 Jul 2016 09:47:23 +0100 Subject: [PATCH] h264 from dcp - mp4/pcm fix - thx @retokromer --- index.html | 17 ++++++++++++----- 1 file changed, 12 insertions(+), 5 deletions(-) diff --git a/index.html b/index.html index 17ecb9b..123dc8c 100644 --- a/index.html +++ b/index.html @@ -134,16 +134,23 @@

H.264 from DCP

-

ffmpeg -i input_video_file.mxf -i input_audio_file.mxf -c:v libx264 -pix_fmt yuv420p -c:a copy output_file

-

This will transcode mxf wrapped video and audio files to an H.264 encoded .mp4 file. Please note this only works for non-encrypted DCPs.

+

ffmpeg -i input_video_file.mxf -i input_audio_file.mxf -c:v libx264 -pix_fmt yuv420p -c:a aac output_file.mp4

+

This will transcode mxf wrapped video and audio files to an H.264 encoded .mp4 file. Please note this only works for unencrypted, single reel DCPs.

ffmpeg
starts the command
-i input_video_file
path and name of the video input file. This extension must be .mxf
-i input_audio_file
path and name of the audio input file. This extension must be .mxf
-c:v libx264
transcodes video to H.264
-
-pix_fmt yuv420p
sets pixel format to yuv420p
-
-c:a copy
use stream copy mode to re-mux instead of re-encode
-
output_file
path, name and extension of the output file
+
-pix_fmt yuv420p
sets pixel format to yuv420p for greater compatibility with media players
+
-c:a aac
re-encodes using the AAC audio codec
+ Note that sadly MP4 cannot contain sound encoded by a PCM (Pulse-Code Modulation) audio codec
+
output_file.mp4
path, name and mp4 extension of the output file
+
+

Variation: Copy PCM audio streams by using Matroska instead of the MP4 container

+

ffmpeg -i input_video_file.mxf -i input_audio_file.mxf -c:v libx264 -pix_fmt yuv420p -c:a copy output_file.mkv

+
+
-c:a copy
re-encodes using the same audio codec
+
output_file.mkv
path, name and .mkv extension of the output file