private long getVideoBitrateBasedOnFileBitrate() {
// file bitrate
String fileBitrate = conversionSetting.getFfProbe().getFormat().getBit_rate();
long fbr;
if (fileBitrate == null || fileBitrate.trim().length() == 0) {
return 0l;
} else {
try {
fbr = Long.parseLong(fileBitrate);
} catch (Exception e) {
// number format exception
return 0l;
}
}
// audio bitrate
long abr;
Stream audioStream = getStream(CODEC_TYPE_AUDIO);
String audioBitrate = audioStream.getBit_rate();
try {
abr = Long.parseLong(audioBitrate);
} catch (Exception e) {
// number format exception
abr = Settings.getDefaultPerChannelAudioBitRate() * audioStream.getChannels();
}
return fbr - abr;
}
private long getVideoBitrateBasedOnVideoStreamBitRate() {
Stream videoStream = getStream(CODEC_TYPE_VIDEO);
try {
return Long.parseLong(videoStream.getBit_rate());
} catch (Exception e) {
// number format exception
return 0l;
}
}
private void addAudioConversion(List<String> cmd) {
cmd.add("-c:a");
cmd.add("libfdk_aac");
/*
High Efficiency profile is giving trouble for some encodings.
e.g.: pcm_s16le, 8000 Hz, 1 channels, s16, 128 kb/s (video from a mini camera I have)
*/
// cmd.add("-profile:a");
// cmd.add("aac_he");
cmd.add("-cutoff");
cmd.add("18000");
boolean bitRateAdded = false;
Stream audioStream = getStream(CODEC_TYPE_AUDIO);
String audioBitRate = audioStream.getBit_rate();
if (audioBitRate == null || audioBitRate.trim().length() == 0) {
// if it doesn't have, just let FFMPEG do its default thing
bitRateAdded = true;
} else {
try {
long abr = Long.parseLong(audioBitRate);
if (abr
> Settings.getMaxPerChannelAudioBitRate(conversionSetting)
* audioStream.getChannels()) {
bitRateAdded = true;
cmd.add("-b:a");
cmd.add(
Long.toString(
Settings.getMaxPerChannelAudioBitRate(conversionSetting)
* audioStream.getChannels()));
}
} catch (Exception e) {
/* number format */
}
}
if (!bitRateAdded) {
cmd.add("-b:a");
cmd.add(audioBitRate);
}
}
private String getVideoBitrate() {
/*
I found cases where mpeg1 streams return the uncompressed bitrate, rendering absurdly high bit rates.
So we're getting the smaller from the two
*/
long br_stream = getVideoBitrateBasedOnVideoStreamBitRate();
long br_file = getVideoBitrateBasedOnFileBitrate();
long br = br_file > br_stream ? br_stream : br_file;
if (br <= 0) return null;
else return Long.toString(br);
}