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

[Christian Johannesen]

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.

diff --git a/libavformat/movenc.c b/libavformat/movenc.c
index b6821d4..136adae 100644
--- a/libavformat/movenc.c
+++ b/libavformat/movenc.c
@@ -2315,6 +2315,10 @@ 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->enc->codec_type == AVMEDIA_TYPE_AUDIO ||
+        track->enc->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);
@@ -2335,7 +2339,7 @@ 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->enc->codec_type == AVMEDIA_TYPE_AUDIO)
         avio_wb16(pb, 0x0100);

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