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Allow output formats without any streams.

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Required for future metadata format.

Originally committed as revision 26100 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Anton Khirnov 2010-12-27 07:46:44 +00:00
parent 18f1add31c
commit bb62d5c1f0
3 changed files with 4 additions and 3 deletions
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2
ffmpeg.c
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@ -1990,7 +1990,7 @@ static int transcode(AVFormatContext **output_files,
nb_ostreams = 0;
for(i=0;i<nb_output_files;i++) {
os = output_files[i];
if (!os->nb_streams) {
if (!os->nb_streams && !(os->oformat->flags & AVFMT_NOSTREAMS)) {
dump_format(output_files[i], i, output_files[i]->filename, 1);
fprintf(stderr, "Output file #%d does not contain any stream\n", i);
ret = AVERROR(EINVAL);

1
libavformat/avformat.h
View File

@ -323,6 +323,7 @@ typedef struct AVFormatParameters {
#define AVFMT_TS_DISCONT 0x0200 /**< Format allows timestamp discontinuities. Note, muxers always require valid (monotone) timestamps */
#define AVFMT_VARIABLE_FPS 0x0400 /**< Format allows variable fps. */
#define AVFMT_NODIMENSIONS 0x0800 /**< Format does not need width/height */
#define AVFMT_NOSTREAMS 0x1000 /**< Format does not require any streams */
typedef struct AVOutputFormat {
const char *name;

4
libavformat/utils.c
View File

@ -2709,7 +2709,7 @@ int av_write_header(AVFormatContext *s)
AVStream *st;
// some sanity checks
if (s->nb_streams == 0) {
if (s->nb_streams == 0 && !(s->oformat->flags & AVFMT_NOSTREAMS)) {
av_log(s, AV_LOG_ERROR, "no streams\n");
return AVERROR(EINVAL);
}
@ -2777,7 +2777,7 @@ int av_write_header(AVFormatContext *s)
#endif
/* set muxer identification string */
if (!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT)) {
if (s->nb_streams && !(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT)) {
av_metadata_set2(&s->metadata, "encoder", LIBAVFORMAT_IDENT, 0);
}