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avformat/movenc: use more fall-back values for average bit rate fields

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If the average bit rate cannot be calculated, such as in the case
of streamed fragmented mp4, utilize various available parameters
in priority order.

Tests are updated where the esds or btrt or ISML manifest boxes'
output changes.
This commit is contained in:
Jan Ekström 2020-09-20 18:14:48 +03:00
parent 3838e8fc21
commit 308882d9f2
2 changed files with 20 additions and 3 deletions
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17
libavformat/movenc.c
View File

@ -648,6 +648,23 @@ static struct mpeg4_bit_rate_values calculate_mpeg4_bit_rates(MOVTrack *track)
struct mpeg4_bit_rate_values bit_rates = { 0 };
bit_rates.avg_bit_rate = compute_avg_bitrate(track);
if (!bit_rates.avg_bit_rate) {
// if the average bit rate cannot be calculated at this point, such as
// in the case of fragmented MP4, utilize the following values as
// fall-back in priority order:
//
// 1. average bit rate property
// 2. bit rate (usually average over the whole clip)
// 3. maximum bit rate property
if (props && props->avg_bitrate) {
bit_rates.avg_bit_rate = props->avg_bitrate;
} else if (track->par->bit_rate) {
bit_rates.avg_bit_rate = track->par->bit_rate;
} else if (props && props->max_bitrate) {
bit_rates.avg_bit_rate = props->max_bitrate;
}
}
// (FIXME should be max rate in any 1 sec window)
bit_rates.max_bit_rate = FFMAX(track->par->bit_rate,

6
tests/ref/lavf/ismv
View File

@ -1,9 +1,9 @@
4c6bc5ac805a76bbbd886a69d2e61554 *tests/data/lavf/lavf.ismv
48fb8d7a5d19bd60f3a49ccf4b7d6593 *tests/data/lavf/lavf.ismv
313169 tests/data/lavf/lavf.ismv
tests/data/lavf/lavf.ismv CRC=0x9d9a638a
18678627921460328ea3fed238d0d57d *tests/data/lavf/lavf.ismv
d19cd8e310a2e94fe0a0d11c5dc29217 *tests/data/lavf/lavf.ismv
322075 tests/data/lavf/lavf.ismv
tests/data/lavf/lavf.ismv CRC=0xe8130120
b9a858caf55b1eff2273e746e9f72dc4 *tests/data/lavf/lavf.ismv
3b6023766845b51b075aed474c00f73c *tests/data/lavf/lavf.ismv
312546 tests/data/lavf/lavf.ismv
tests/data/lavf/lavf.ismv CRC=0x9d9a638a