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ffmpeg: add option recast_media

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Allows forcing decoders of different media type.
Needed to decode media data muxed as data streams.
This commit is contained in:
Gyan Doshi 2021-07-02 15:30:21 +05:30
parent 7bd7377ddb
commit 79ebdbb9b9
2 changed files with 11 additions and 1 deletions
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5
doc/ffmpeg.texi
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@ -449,6 +449,11 @@ output file already exists.
Set number of times input stream shall be looped. Loop 0 means no loop,
loop -1 means infinite loop.
@item -recast_media (@emph{global})
Allow forcing a decoder of a different media type than the one
detected or designated by the demuxer. Useful for decoding media
data muxed as data streams.
@item -c[:@var{stream_specifier}] @var{codec} (@emph{input/output,per-stream})
@itemx -codec[:@var{stream_specifier}] @var{codec} (@emph{input/output,per-stream})
Select an encoder (when used before an output file) or a decoder (when used

7
fftools/ffmpeg_opt.c
View File

@ -186,6 +186,7 @@ static int input_sync;
static int input_stream_potentially_available = 0;
static int ignore_unknown_streams = 0;
static int copy_unknown_streams = 0;
static int recast_media = 0;
static int find_stream_info = 1;
static void uninit_options(OptionsContext *o)
@ -759,7 +760,7 @@ static const AVCodec *find_codec_or_die(const char *name, enum AVMediaType type,
av_log(NULL, AV_LOG_FATAL, "Unknown %s '%s'\n", codec_string, name);
exit_program(1);
}
if (codec->type != type) {
if (codec->type != type && !recast_media) {
av_log(NULL, AV_LOG_FATAL, "Invalid %s type '%s'\n", codec_string, name);
exit_program(1);
}
@ -774,6 +775,8 @@ static const AVCodec *choose_decoder(OptionsContext *o, AVFormatContext *s, AVSt
if (codec_name) {
const AVCodec *codec = find_codec_or_die(codec_name, st->codecpar->codec_type, 0);
st->codecpar->codec_id = codec->id;
if (recast_media && st->codecpar->codec_type != codec->type)
st->codecpar->codec_type = codec->type;
return codec;
} else
return avcodec_find_decoder(st->codecpar->codec_id);
@ -3429,6 +3432,8 @@ const OptionDef options[] = {
"Ignore unknown stream types" },
{ "copy_unknown", OPT_BOOL | OPT_EXPERT, { &copy_unknown_streams },
"Copy unknown stream types" },
{ "recast_media", OPT_BOOL | OPT_EXPERT, { &recast_media },
"allow recasting stream type in order to force a decoder of different media type" },
{ "c", HAS_ARG | OPT_STRING | OPT_SPEC |
OPT_INPUT | OPT_OUTPUT, { .off = OFFSET(codec_names) },
"codec name", "codec" },