diff options
| -rw-r--r-- | doc/ffmpeg.texi | 13 | ||||
| -rw-r--r-- | ffmpeg_opt.c | 23 | ||||
| -rw-r--r-- | tests/fate/ffmpeg.mak | 8 | ||||
| -rw-r--r-- | tests/ref/fate/mapchan-2ch-extract-ch0-ch2-trailing | 1 | ||||
| -rw-r--r-- | tests/ref/fate/mapchan-3ch-extract-ch0-ch2-trailing | 1 |
5 files changed, 42 insertions, 4 deletions
diff --git a/doc/ffmpeg.texi b/doc/ffmpeg.texi index 4616a4239e..de6d3f139a 100644 --- a/doc/ffmpeg.texi +++ b/doc/ffmpeg.texi @@ -996,7 +996,7 @@ such streams is attempted. Allow input streams with unknown type to be copied instead of failing if copying such streams is attempted. -@item -map_channel [@var{input_file_id}.@var{stream_specifier}.@var{channel_id}|-1][:@var{output_file_id}.@var{stream_specifier}] +@item -map_channel [@var{input_file_id}.@var{stream_specifier}.@var{channel_id}|-1][?][:@var{output_file_id}.@var{stream_specifier}] Map an audio channel from a given input to an output. If @var{output_file_id}.@var{stream_specifier} is not set, the audio channel will be mapped on all the audio streams. @@ -1005,6 +1005,10 @@ Using "-1" instead of @var{input_file_id}.@var{stream_specifier}.@var{channel_id} will map a muted channel. +A trailing @code{?} will allow the map_channel to be +optional: if the map_channel matches no channel the map_channel will be ignored instead +of failing. + For example, assuming @var{INPUT} is a stereo audio file, you can switch the two audio channels with the following command: @example @@ -1052,6 +1056,13 @@ video stream), you can use the following command: ffmpeg -i input.mkv -filter_complex "[0:1] [0:2] amerge" -c:a pcm_s16le -c:v copy output.mkv @end example +To map the first two audio channels from the first input, and using the +trailing @code{?}, ignore the audio channel mapping if the first input is +mono instead of stereo: +@example +ffmpeg -i INPUT -map_channel 0.0.0 -map_channel 0.0.1? OUTPUT +@end example + @item -map_metadata[:@var{metadata_spec_out}] @var{infile}[:@var{metadata_spec_in}] (@emph{output,per-metadata}) Set metadata information of the next output file from @var{infile}. Note that those are file indices (zero-based), not filenames. diff --git a/ffmpeg_opt.c b/ffmpeg_opt.c index 1c4a11ef21..f275f711be 100644 --- a/ffmpeg_opt.c +++ b/ffmpeg_opt.c @@ -405,6 +405,11 @@ static int opt_map_channel(void *optctx, const char *opt, const char *arg) int n; AVStream *st; AudioChannelMap *m; + char *allow_unused; + char *mapchan; + mapchan = av_strdup(arg); + if (!mapchan) + return AVERROR(ENOMEM); GROW_ARRAY(o->audio_channel_maps, o->nb_audio_channel_maps); m = &o->audio_channel_maps[o->nb_audio_channel_maps - 1]; @@ -415,6 +420,7 @@ static int opt_map_channel(void *optctx, const char *opt, const char *arg) m->file_idx = m->stream_idx = -1; if (n == 1) m->ofile_idx = m->ostream_idx = -1; + av_free(mapchan); return 0; } @@ -450,11 +456,22 @@ static int opt_map_channel(void *optctx, const char *opt, const char *arg) m->file_idx, m->stream_idx); exit_program(1); } + /* allow trailing ? to map_channel */ + if (allow_unused = strchr(mapchan, '?')) + *allow_unused = 0; if (m->channel_idx < 0 || m->channel_idx >= st->codecpar->channels) { - av_log(NULL, AV_LOG_FATAL, "mapchan: invalid audio channel #%d.%d.%d\n", - m->file_idx, m->stream_idx, m->channel_idx); - exit_program(1); + if (allow_unused) { + av_log(NULL, AV_LOG_VERBOSE, "mapchan: invalid audio channel #%d.%d.%d\n", + m->file_idx, m->stream_idx, m->channel_idx); + } else { + av_log(NULL, AV_LOG_FATAL, "mapchan: invalid audio channel #%d.%d.%d\n" + "To ignore this, add a trailing '?' to the map_channel.\n", + m->file_idx, m->stream_idx, m->channel_idx); + exit_program(1); + } + } + av_free(mapchan); return 0; } diff --git a/tests/fate/ffmpeg.mak b/tests/fate/ffmpeg.mak index 0ec5a34921..f3fbc841b2 100644 --- a/tests/fate/ffmpeg.mak +++ b/tests/fate/ffmpeg.mak @@ -10,6 +10,14 @@ FATE_MAPCHAN-$(CONFIG_CHANNELMAP_FILTER) += fate-mapchan-silent-mono fate-mapchan-silent-mono: tests/data/asynth-22050-1.wav fate-mapchan-silent-mono: CMD = md5 -i $(TARGET_PATH)/tests/data/asynth-22050-1.wav -map_channel -1 -map_channel 0.0.0 -fflags +bitexact -f wav +FATE_MAPCHAN-$(CONFIG_CHANNELMAP_FILTER) += fate-mapchan-2ch-extract-ch0-ch2-trailing +fate-mapchan-2ch-extract-ch0-ch2-trailing: tests/data/asynth-44100-2.wav +fate-mapchan-2ch-extract-ch0-ch2-trailing: CMD = md5 -i $(TARGET_PATH)/tests/data/asynth-44100-2.wav -map_channel 0.0.0 -map_channel 0.0.2? -fflags +bitexact -f wav + +FATE_MAPCHAN-$(CONFIG_CHANNELMAP_FILTER) += fate-mapchan-3ch-extract-ch0-ch2-trailing +fate-mapchan-3ch-extract-ch0-ch2-trailing: tests/data/asynth-44100-3.wav +fate-mapchan-3ch-extract-ch0-ch2-trailing: CMD = md5 -i $(TARGET_PATH)/tests/data/asynth-44100-3.wav -map_channel 0.0.0 -map_channel 0.0.2? -fflags +bitexact -f wav + FATE_MAPCHAN = $(FATE_MAPCHAN-yes) FATE_FFMPEG += $(FATE_MAPCHAN) diff --git a/tests/ref/fate/mapchan-2ch-extract-ch0-ch2-trailing b/tests/ref/fate/mapchan-2ch-extract-ch0-ch2-trailing new file mode 100644 index 0000000000..a5400373cf --- /dev/null +++ b/tests/ref/fate/mapchan-2ch-extract-ch0-ch2-trailing @@ -0,0 +1 @@ +b6e1d142b4e484221562e7b66b9bbbdc diff --git a/tests/ref/fate/mapchan-3ch-extract-ch0-ch2-trailing b/tests/ref/fate/mapchan-3ch-extract-ch0-ch2-trailing new file mode 100644 index 0000000000..6237a988be --- /dev/null +++ b/tests/ref/fate/mapchan-3ch-extract-ch0-ch2-trailing @@ -0,0 +1 @@ +ae533985186cab287309c04f6b3e866c |