[FFmpeg-user] Enable all audio tracks for MOV container

[Rens Dijkshoorn]

----- Original Message -----
> From: "Christian Johannesen" <chrisjohannesen at gmail.com>
> To: "FFmpeg user questions" <ffmpeg-user at ffmpeg.org>
> Sent: Tuesday, 19 July, 2016 21:41:48
> Subject: [FFmpeg-user] Enable all audio tracks for MOV container

> Hi all -
> 
> I had been using a patch from this mailing list on the FFMPEG source code
> to enable all audio tracks when encoding QuickTime MOV.
> 
> 
> However, it seems as though this no longer works as movenc has been
> modified since it last worked for me with source code from March 25th 2016.
> Is there a way to enable all audio tracks when encoding a MOV with the
> current source or does anyone have an updated patch?
> 
> Thanks,
> Chris

Hi Chris,

this is my update patch, should work with current GIT version. 

diff --git a/libavformat/movenc.c b/libavformat/movenc.c
index d614933..a30916b 100644
--- a/libavformat/movenc.c
+++ b/libavformat/movenc.c
@@ -2410,6 +2410,10 @@ static int mov_write_tkhd_tag(AVIOContext *pb, MOVMuxContext *mov,
     (version == 1) ? avio_wb32(pb, 104) : avio_wb32(pb, 92); /* size */
     ffio_wfourcc(pb, "tkhd");
     avio_w8(pb, version);
+    if (track->par->codec_type == AVMEDIA_TYPE_AUDIO ||
+        track->par->codec_type == AVMEDIA_TYPE_DATA) /* enable all audio & data tracks */
+    avio_wb24(pb, 0xf);
+    else
     avio_wb24(pb, flags);
     if (version == 1) {
         avio_wb64(pb, track->time);
@@ -2430,7 +2434,7 @@ static int mov_write_tkhd_tag(AVIOContext *pb, MOVMuxContext *mov,
     avio_wb32(pb, 0); /* reserved */
     avio_wb32(pb, 0); /* reserved */
     avio_wb16(pb, 0); /* layer */
-    avio_wb16(pb, group); /* alternate group) */
+    avio_wb16(pb, 0x0); /* set alternate group 0 as default ) */
     /* Volume, only for audio */
     if (track->par->codec_type == AVMEDIA_TYPE_AUDIO)
         avio_wb16(pb, 0x0100);

Regards

Rens