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mplayer output 4 audio channels to jack
14 novembre 2013, par MrCastroI am struggling with getting mplayer to reproduce a 4 audio channel wav file.
I created a 4chn audio file. Want mplayer to player, and output it to jack. The problem is that i am only able to get in jack 2 mplayer channels.
if I do:
mplayer -ao jack -channels 4 test_4chan_2.wav
mplayer plays and responds:
laying test_4chan_2.wav. libavformat version 54.6.100 (internal) Audio only file format detected. Load subtitles in ./ ========================================================================== Opening audio decoder: [pcm] Uncompressed PCM audio decoder AUDIO: 44100 Hz, 4 ch, s16le, 2822.4 kbit/100.00% (ratio: 352800->352800) Selected audio codec: [pcm] afm: pcm (Uncompressed PCM) ========================================================================== AO: [jack] 44100Hz 2ch floatle (4 bytes per sample) Video: no video Starting playback...
and jack has only the following outputs:
system:capture_1 system:capture_2 system:playback_1 system:playback_2 MPlayer [14434]:out_0 MPlayer [14434]:out_1
So it seems that mplayer recognizes that the input file as 4ch but on AO: [jack] only 2ch appear
if I try the same with ecasound:
ecasound -f 16,4,44100 -i test_4chan_2.wav -o jack
in Jack ecasoud appears with 4 outputs
system:capture_1 system:capture_2 system:playback_1 system:playback_2 ecasound:out_1 ecasound:out_2 ecasound:out_3 ecasound:out_4
Do you have any idea of what could I be doing wrong?? I am running Debian (Jessy) and mplayer 1.1-4.7
Thanks a lot
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Extract WAV from an MP4, process and then remux it back
13 novembre 2013, par Matt J.I have a large number of x264+AAC MP4 files. I have written an audio filter that operates on PCM wav files that I want to apply to the audio on all my videos, replacing the existing audio with the filtered version.
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Hide system message while running ffmpeg
13 novembre 2013, par Irene T.I am using the code bellow to grab an image from a video file and it is working great. But when i am running the php file that contains the code bellow all system procceses appears, and i mean some infos about the convertion, export etc.
How can i make it run silent?
$stderr = system("ffmpeg -i $videoPath -vframes 1 -an -s 306x173 -ss 03 $finalfilename 2>&1 >/dev/null", $exit_status); if ($exit_status === 0) { print 'Done! :)'; } else { print 'Error... :/'; // $stderr will help you figure out what happened... }
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Find absolute path to ffmpeg
13 novembre 2013, par Irene T.I installed ffmpeg and ffmpeg-php to my dedicated server and with a small script i am trying to extract an image from specific second.
<?php $extension = "ffmpeg"; $extension_soname = $extension . "." . PHP_SHLIB_SUFFIX; $extension_fullname = PHP_EXTENSION_DIR . "/" . $extension_soname; $timeOffset = "00:00:30"; $videoPath = "sample.mp4"; $extensi = ".jpg"; $folder = "images/"; $finalfilename = $folder . $randomfilename . $extensi; echo $extension_fullname; //I AM GETING THIS /usr/lib64/php/modules/ffmpeg.so if (exec("ffmpeg -ss $timeOffset -i $videoPath -frames:v 1 $finalfilename")){ echo "Done"; }else{ echo "Error"; } ?>
as you can see in my execution command ther is ffmpeg, but how can i find the absolute path to ffmpeg? Take a look in my screenshot maybe this helps you to tell me..
My last question is what is ffmpeg-php? Do i need it? i already install it.
Thank you
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PHP - Converting images to video using ffmpeg
13 novembre 2013, par VishnuI am good in php but very new to ffmpeg and exec stuffs.Now I have successfully installed ffmpeg via ssh.I referred some stackoverflow here and found below code to make video using several images.
<?php echo exec('ffmpeg -f image2 -i image%d.jpg video.mpg'); ?>
I have image1.jpg and image2.jpg in same folder.I run this php code but nothing happened...where does video.mpg gets saved ? and how to check if exec function ran successfully or how to debug it ?Any help is appreciated.