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vtl: ffmpeg interaction:

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* use ardour/SRC to resample audio on import
* parse framerate via codec-timebase if available
* update encoder parameters
* add vpx/webm as codec option
This commit is contained in:
Robin Gareus 2013-03-31 19:34:05 +02:00
parent 6f78b82452
commit ab3040f789
2 changed files with 53 additions and 35 deletions
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54
gtk2_ardour/transcode_ffmpeg.cc
View file

@ -117,19 +117,20 @@ TranscodeFfmpeg::probe ()
std::vector<std::vector<std::string> > lines;
ParseCSV(ffoutput, lines);
double timebase = 0;
m_width = m_height = 0;
m_fps = m_aspect = 0;
m_duration = 0;
m_codec.clear();
m_audio.clear();
#define PARSE_FRACTIONAL_FPS \
#define PARSE_FRACTIONAL_FPS(VAR) \
{ \
std::string::size_type pos; \
m_fps = atof(value.c_str()); \
VAR = atof(value.c_str()); \
pos = value.find_first_of('/'); \
if (pos != std::string::npos) { \
m_fps = atof(value.substr(0, pos).c_str()) / atof(value.substr(pos+1).c_str()); \
VAR = atof(value.substr(0, pos).c_str()) / atof(value.substr(pos+1).c_str()); \
} \
}
@ -160,9 +161,11 @@ TranscodeFfmpeg::probe ()
if (!m_codec.empty()) m_codec += " ";
m_codec += "(" + value + ")";
} else if (key == X_("r_frame_rate")) {
PARSE_FRACTIONAL_FPS
} else if (key == X_("time_base") && m_fps == 0) {
PARSE_FRACTIONAL_FPS
PARSE_FRACTIONAL_FPS(m_fps)
} else if (key == X_("avg_frame_rate") && m_fps == 0) {
PARSE_FRACTIONAL_FPS(m_fps)
} else if (key == X_("time_base")) {
PARSE_FRACTIONAL_FPS(timebase)
} else if (key == X_("timecode") && m_duration == 0) {
int h,m,s; char f[7];
if (sscanf(i->at(16).c_str(), "%d:%d:%d:%s",&h,&m,&s,f) == 4) {
@ -173,9 +176,9 @@ TranscodeFfmpeg::probe ()
+ atoi(f) / pow(10, strlen(f))
));
}
} else if (key == X_("duration_ts")) {
m_duration = atof(value.c_str());
} else if (key == X_("duration") && m_duration == 0 && m_fps != 0) {
} else if (key == X_("duration_ts") && m_fps == 0 && timebase !=0 ) {
m_duration = atof(value.c_str()) * m_fps * timebase;
} else if (key == X_("duration") && m_fps != 0 && m_duration == 0) {
m_duration = atof(value.c_str()) * m_fps;
} else if (key == X_("display_aspect_ratio")) {
std::string::size_type pos;
@ -357,23 +360,26 @@ TranscodeFfmpeg::extract_audio (std::string outfile, ARDOUR::framecnt_t samplera
if (stream >= m_audio.size()) return false;
char **argp;
int i = 0;
argp=(char**) calloc(15,sizeof(char*));
argp[0] = strdup(ffmpeg_exe.c_str());
argp[1] = strdup("-i");
argp[2] = strdup(infile.c_str());
argp[3] = strdup("-ar");
argp[4] = (char*) calloc(7,sizeof(char)); snprintf(argp[4], 7, "%"PRId64, samplerate);
argp[5] = strdup("-ac");
argp[6] = (char*) calloc(3,sizeof(char)); snprintf(argp[6], 3, "%i", m_audio.at(stream).channels);
argp[7] = strdup("-map");
argp[8] = (char*) calloc(8,sizeof(char)); snprintf(argp[8], 8, "0:%s", m_audio.at(stream).stream_id.c_str());
argp[9] = strdup("-vn");
argp[10] = strdup("-acodec");
argp[11] = strdup("pcm_f32le");
argp[12] = strdup("-y");
argp[13] = strdup(outfile.c_str());
argp[14] = (char *)0;
argp[i++] = strdup(ffmpeg_exe.c_str());
argp[i++] = strdup("-i");
argp[i++] = strdup(infile.c_str());
#if 0 // native samplerate -- use a3/SRC
argp[i++] = strdup("-ar");
argp[i] = (char*) calloc(7,sizeof(char)); snprintf(argp[i++], 7, "%"PRId64, samplerate);
#endif
argp[i++] = strdup("-ac");
argp[i] = (char*) calloc(3,sizeof(char)); snprintf(argp[i++], 3, "%i", m_audio.at(stream).channels);
argp[i++] = strdup("-map");
argp[i] = (char*) calloc(8,sizeof(char)); snprintf(argp[i++], 8, "0:%s", m_audio.at(stream).stream_id.c_str());
argp[i++] = strdup("-vn");
argp[i++] = strdup("-acodec");
argp[i++] = strdup("pcm_f32le");
argp[i++] = strdup("-y");
argp[i++] = strdup(outfile.c_str());
argp[i++] = (char *)0;
/* Note: argp is free()d in ~SystemExec */
#if 1 /* DEBUG */
if (debug_enable) { /* tentative debug mode */