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movenc: Add a min_frag_duration option 

The other fragmentation options (frag_duration, frag_size and
frag_keyframe) are combined with OR, cutting fragments at the
first of the conditions being fulfilled.

Signed-off-by: Martin Storsjö <martin@martin.st>
This commit is contained in:
Martin Storsjö 2012-03-19 19:31:15 +02:00
parent ccfa8aa26f
commit 39f5a5462c
3 changed files with 18 additions and 5 deletions
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7
doc/muxers.texi
View File

@ -172,8 +172,15 @@ Allow the caller to manually choose when to cut fragments, by
calling @code{av_write_frame(ctx, NULL)} to write a fragment with
the packets written so far. (This is only useful with other
applications integrating libavformat, not from @command{avconv}.)
@item -min_frag_duration @var{duration}
Don't create fragments that are shorter than @var{duration} microseconds long.
@end table
If more than one condition is specified, fragments are cut when
one of the specified conditions is fulfilled. The exception to this is
@code{-min_frag_duration}, which has to be fulfilled for any of the other
conditions to apply.
Additionally, the way the output file is written can be adjusted
through a few other options:

15
libavformat/movenc.c
View File

@ -56,6 +56,7 @@ static const AVOption options[] = {
{ "iods_audio_profile", "iods audio profile atom.", offsetof(MOVMuxContext, iods_audio_profile), AV_OPT_TYPE_INT, {.dbl = -1}, -1, 255, AV_OPT_FLAG_ENCODING_PARAM},
{ "iods_video_profile", "iods video profile atom.", offsetof(MOVMuxContext, iods_video_profile), AV_OPT_TYPE_INT, {.dbl = -1}, -1, 255, AV_OPT_FLAG_ENCODING_PARAM},
{ "frag_duration", "Maximum fragment duration", offsetof(MOVMuxContext, max_fragment_duration), AV_OPT_TYPE_INT, {.dbl = 0}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM},
{ "min_frag_duration", "Minimum fragment duration", offsetof(MOVMuxContext, min_fragment_duration), AV_OPT_TYPE_INT, {.dbl = 0}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM},
{ "frag_size", "Maximum fragment size", offsetof(MOVMuxContext, max_fragment_size), AV_OPT_TYPE_INT, {.dbl = 0}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM},
{ "ism_lookahead", "Number of lookahead entries for ISM files", offsetof(MOVMuxContext, ism_lookahead), AV_OPT_TYPE_INT, {.dbl = 0}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM},
{ NULL },
@ -2831,21 +2832,25 @@ static int mov_write_packet_internal(AVFormatContext *s, AVPacket *pkt)
unsigned int samples_in_chunk = 0;
int size= pkt->size;
uint8_t *reformatted_data = NULL;
int64_t frag_duration = 0;
if (!s->pb->seekable && !(mov->flags & FF_MOV_FLAG_EMPTY_MOOV))
return 0; /* Can't handle that */
if (!size) return 0; /* Discard 0 sized packets */
if ((mov->max_fragment_duration && trk->entry &&
av_rescale_q(pkt->dts - trk->cluster[0].dts,
s->streams[pkt->stream_index]->time_base,
AV_TIME_BASE_Q) >= mov->max_fragment_duration) ||
if (trk->entry)
frag_duration = av_rescale_q(pkt->dts - trk->cluster[0].dts,
s->streams[pkt->stream_index]->time_base,
AV_TIME_BASE_Q);
if ((mov->max_fragment_duration &&
frag_duration >= mov->max_fragment_duration) ||
(mov->max_fragment_size && mov->mdat_size + size >= mov->max_fragment_size) ||
(mov->flags & FF_MOV_FLAG_FRAG_KEYFRAME &&
enc->codec_type == AVMEDIA_TYPE_VIDEO &&
trk->entry && pkt->flags & AV_PKT_FLAG_KEY)) {
mov_flush_fragment(s);
if (frag_duration >= mov->min_fragment_duration)
mov_flush_fragment(s);
}
if (mov->flags & FF_MOV_FLAG_FRAGMENT) {

1
libavformat/movenc.h
View File

@ -149,6 +149,7 @@ typedef struct MOVMuxContext {
int fragments;
int max_fragment_duration;
int min_fragment_duration;
int max_fragment_size;
int ism_lookahead;
AVIOContext *mdat_buf;