Bitrate Atom MP4 enhancement

[Mista_D]

Missing btrt atom in MP4 files:

FFmpeg currently doesn't store average bitrate, max bitrate and buffer size in MP4 MOOV. Would be great to keep this info in MP4 for streaming purposes

ISO-14496 part15 page 20: ​http://hsevi.ir/RI_Standard/File/8978

[Mista_D]

​http://www.mediafire.com/file/dwawitzp5xmc9vd/btrt.mp4

test file with btrt Atom.

[Mista_D]

Bounty of €250 ($300 USD) to whomever implements it before August 14, 2017 please.

Some work was already done before it seems... ​https://trac.ffmpeg.org/ticket/551

Thank you

[oscord]

@line 1077

+static int mov_write_btrt_tag(AVIOContext *pb, MOVTrack *track)
+{
+ AVCPBProperties *props;
+ int64_t pos = avio_tell(pb);
+ unsigned avg_bitrate;
+ props = (AVCPBProperties*)av_stream_get_side_data(track->st, AV_PKT_DATA_CPB_PROPERTIES, NULL);
+ avg_bitrate = compute_avg_bitrate(track);
+
+ avio_wb32(pb, 0);
+ ffio_wfourcc(pb, "btrt");
+ avio_wb32(pb, props ? props->buffer_size : 0);
+ avio_wb32(pb, props ? FFMAX3(props->max_bitrate, props->avg_bitrate, avg_bitrate) : FFMAX(track->par->bit_rate, avg_bitrate));
+ avio_wb32(pb, avg_bitrate);
+ return update_size(pb, pos);
+}

@line 1939

mov_write_avcc_tag(pb, track);

+ mov_write_btrt_tag(pb, track);

if (track->mode == MODE_IPOD)

Use the cash for something good

[oscord]

libavformat/movenc.c

[Mista_D]

Its adding some junk into MOOV after btrt. Not working

Thank you for trying though

[Mista_D]

Apologies, my file analyzer didn't recognize pasp atom. Your patch is working as intended.

[Mista_D]

Donated $250 to ​http://en.pomogi.org to help sick kids

Transaction ID 91Y16613BC393983T

Thank you.

[Carl Eugen Hoyos]

Please consider sending the patch - made with git format-patch - to the FFmpeg development mailing list.

[Mista_D]

libavformat/movenc.c patch

[Mista_D]

got it, submitting to the mailing list

[Carl Eugen Hoyos]

No.

Please submit a patch made with git format-patch.

[Andy Dust]

It'd be great if this could be added. Thanks.

[Balling]

It was added though? 3838e8fc210aa09a9f9058506c0ce80b6ad9b9c3

And it is being written. I verified it like some 6 months ago.