openharmony/third_party_ffmpeg
1
0
Fork 0
mirror of https://gitee.com/openharmony/third_party_ffmpeg synced 2024-11-23 19:30:05 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

ffmpeg: add option to control copying of frames prior to start.

Browse Source 
Normally we discard things prior to the intended start
for stream copy this is not always possible, and its not done by default
this option allows discarding to be enabled

this is primarely usefull when transcoding a video and stream copying an
audio stream.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2012-09-27 03:37:27 +02:00
parent d37044647f
commit 65f7aee63b
3 changed files with 12 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
ffmpeg.c
View File

@ -1340,6 +1340,10 @@ static void do_streamcopy(InputStream *ist, OutputStream *ost, const AVPacket *p
!ost->copy_initial_nonkeyframes)
return;
if (!ost->frame_number && ist->pts < of->start_time &&
!ost->copy_prior_start)
return;
if (of->recording_time != INT64_MAX &&
ist->pts >= of->recording_time + of->start_time) {
close_output_stream(ost);

3
ffmpeg.h
View File

@ -157,6 +157,8 @@ typedef struct OptionsContext {
int nb_presets;
SpecifierOpt *copy_initial_nonkeyframes;
int nb_copy_initial_nonkeyframes;
SpecifierOpt *copy_prior_start;
int nb_copy_prior_start;
SpecifierOpt *filters;
int nb_filters;
SpecifierOpt *fix_sub_duration;
@ -326,6 +328,7 @@ typedef struct OutputStream {
int stream_copy;
const char *attachment_filename;
int copy_initial_nonkeyframes;
int copy_prior_start;
int keep_pix_fmt;
} OutputStream;

5
ffmpeg_opt.c
View File

@ -960,6 +960,9 @@ static OutputStream *new_output_stream(OptionsContext *o, AVFormatContext *oc, e
ost->max_frames = INT64_MAX;
MATCH_PER_STREAM_OPT(max_frames, i64, ost->max_frames, oc, st);
ost->copy_prior_start = -1;
MATCH_PER_STREAM_OPT(copy_prior_start, i, ost->copy_prior_start, oc ,st);
MATCH_PER_STREAM_OPT(bitstream_filters, str, bsf, oc, st);
while (bsf) {
if (next = strchr(bsf, ','))
@ -2316,6 +2319,8 @@ const OptionDef options[] = {
"exit on error", "error" },
{ "copyinkf", OPT_BOOL | OPT_EXPERT | OPT_SPEC, { .off = OFFSET(copy_initial_nonkeyframes) },
"copy initial non-keyframes" },
{ "copypriorss", OPT_INT | HAS_ARG | OPT_EXPERT | OPT_SPEC, { .off = OFFSET(copy_prior_start) },
"copy or discard frames before start time" },
{ "frames", OPT_INT64 | HAS_ARG | OPT_SPEC, { .off = OFFSET(max_frames) },
"set the number of frames to record", "number" },
{ "tag", OPT_STRING | HAS_ARG | OPT_SPEC | OPT_EXPERT,{ .off = OFFSET(codec_tags) },