ffprobe about my input: Duration: 00:02:50.54, start: 0.000000, bitrate: 40 kb/s Stream #0:0: Audio: vorbis, 22050 Hz, mono, fltp, 35 kb/s Filesize: 834K I use this command to convert this vorbis to the aac: ffmpeg -i input.ogg -vbr 1 output.aac I am not an audio expert and hear no difference with original aac, ok, quality … Read more
From HIK Vision camera I get G.711ulaw audio. Need to help to convert the audio to AAC or any YouTube supported audio so that I can stream my IP camera to YouTube live. Thanks in advance. FFMPEG command: ffmpeg -re -y -f lavfi -i anullsrc -rtsp_transport tcp -i $RTSP -acodec aac -f flv -flvflags no_duration_filesize … Read more
I am downloading some music from Youtube, and it seems that in most cases (popular videos), the best quality audio is an opus file. I know that (1) Opus is the newest and more efficient codec, and (2) converting from one lossy codec to another is not recommended. However, as I want to use the … Read more
Let’s say I have two similar audio files in different format (such as MP3 and AAC) from the same master (CD audio or WAV file) and I want to find some differences of quality between the two files. (to examine their quality change and compression techniques) I did some research on it and figured out … Read more
When using this https://libav.org/releases/libav-12.3.tar.gz library and running in the folder: “./configure –enable-static –enable-version3 –enable-libvo-aacenc” the error “ERROR libvo_aacenc not found” shows up. If I run “./configure –enable-static –enable-libvo-aacenc” the message libvo-aacenc is version3 and version3 is not specified. “./configure –list-encoders” shows aac as well as libvo-aacenc. Why can’t I activate the libvo-aacenc? Answer AttributionSource : … Read more
Is there a way in VLC player to ascertain the audio codec being used while playing a live stream via URL ? I am able to see “Codec: MPEG AAC Audio” in Codec Info but I want to see what type of AAC is being used i.e. is it AAC-LC, AAC-LD, AAC-ELD. If it is … Read more
While using a proprietary SDK I had the following observations: 1) Could hear audio (AAC-LD) and see video (H.264) during the playback of MP4 video file. 2) Could not hear audio (AAC-LD) but could see video (H.264) while live streaming an MPEG2-TS stream via RTSP. 3) Could hear audio (AAC-LC) and see video (H.264) while … Read more
I have a movie with AC3 5.1 audio with 48khz of sample rate and change to AAC using libfdk_aac codec. I don’t know if use the same sample rate or set to 44.1khz. In the libfdk_aac documentation the recomendation for 5.1 is use 44.1khz. It’s a bad idea set the same rate or is better … Read more
It may be easy, but I’m new to ffmpeg and struggle with converting an mp3 audio to an aac audio file with .m4a file extension using ffmpeg on the command line (Win10). input: Stream #0:0: Audio: mp3, 44100 Hz, stereo, s16p, 128 kb/s desired output: Stream #0:0: Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, … Read more
From HIK Vision camera I get G.711ulaw audio. Need to help to convert the audio to AAC or any YouTube supported audio so that I can stream my IP camera to YouTube live. Thanks in advance. FFMPEG command: ffmpeg -re -y -f lavfi -i anullsrc -rtsp_transport tcp -i $RTSP -acodec aac -f flv -flvflags no_duration_filesize … Read more
