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FFmpeg Codecs Documentation
https://ffmpeg.org/ffmpeg-codecs.html
A description of some of the currently available audio encoders follows. 8.1 aac. Advanced Audio Coding (AAC) encoder. This encoder is the default AAC encoder, natively implemented into FFmpeg. 8.1.1 Options b. Set bit rate in bits/s. Setting this automatically activates constant bit rate (CBR) mode. If this option is unspecified it is set to 128kbps. q
Libavcodec Documentation - FFmpeg
https://ffmpeg.org/libavcodec.html
The libavcodec library provides a generic encoding/decoding framework and contains multiple decoders and encoders for audio, video and subtitle streams, and several bitstream filters. The shared architecture provides various services ranging from bit stream I/O to DSP optimizations, and makes it suitable for implementing robust and fast codecs ...
FFmpeg Bitstream Filters Documentation
https://ffmpeg.org/ffmpeg-bitstream-filters.html
Convert MPEG-2/4 AAC ADTS to an MPEG-4 Audio Specific Configuration bitstream. This filter creates an MPEG-4 AudioSpecificConfig from an MPEG-2/4 ADTS header and removes the ADTS header. This filter is required for example when copying an AAC stream from a raw ADTS AAC or an MPEG-TS container to MP4A-LATM, to an FLV file, or to MOV/MP4 files ...
FFmpeg: libavcodec/mpeg4audio.c File Reference
https://ffmpeg.org/doxygen/0.6/mpeg4audio_8c.html
Parse MPEG-4 audio configuration for ALS object type. static int : get_object_type (GetBitContext *gb) static int : get_sample_rate (GetBitContext *gb, int *index) int : ff_mpeg4audio_get_config (MPEG4AudioConfig *c, const uint8_t *buf, int buf_size) Parse MPEG-4 systems extradata to retrieve audio configuration. static av_always_inline ...
ffmpeg - How to encode audio in AAC-LC, AAC-HE-V1, …
https://stackoverflow.com/questions/18894810/how-to-encode-audio-in-aac-lc-aac-he-v1-aac-he-v2-using-libavcodec
I am trying to encode audio in AAC-LC,AAC-HE-V1, AAC-HE-V2 using libavcodec/ffmpeg APIs. But when I am using the following configuration and API calls.It says "invalid AAC profile." AVCodecContext *
Encoding AAC stereo audio which starts silently ... - FFmpeg
https://trac.ffmpeg.org/ticket/566
Interestingly, the problem seems to occur at the silence-to-audio boundary; encoding either before the sound starts. ffmpeg -y -i 'initialSilence.mp4' -f mpegts -t 5 -acodec libfaac -ab 40k -ar 22050 initialSilence.ts. or after the silence ends. ffmpeg -y -i 'initialSilence.mp4' -f mpegts -ss 8 -acodec libfaac -ab 40k -ar 22050 initialSilence.ts. produce mpegts files which ffprobe reports as …
ffmpeg is generating an out-of-sync audio/video file ...
https://stackoverflow.com/questions/8844460/ffmpeg-is-generating-an-out-of-sync-audio-video-file
The audio seems ok but the video seems slow and therefore out of sync with the audio. Here is the command I am running: /opt/local/bin/ffmpeg -i complaint.flv -f mp4 -vcodec libx264 -acodec aac -copyts -strict experimental -fpre /opt/local/share/ffmpeg/libx264-lossless_slow.ffpreset -ab 44k -threads 0 -crf 23 complaint.mp4 And the output:
Redirection To SUPER - Free Audio Converter
https://www.erightsoft.com/eRightSoft/
A GUI to FFmpeg, MEncoder, MPlayer, x264, MusePack, Monkey's audio, Shorten audio, TAK audio, True audio, WavPack, the libavcodec library & …
Missing aac audio after encoding to mpeg-ts ... - ffmpeg.org
https://ffmpeg.org/trac/ffmpeg/ticket/542
When encoding from h264/aac mp4 to mpeg-ts, the audio stream is lost or corrupt. Mediainfo reports an audio stream but it appears to be empty. This *only* occurs when '-threads' set to 0. Using a specific thread size (e.g. -threads 4) prevents the issue. I can consistently reproduce this with centos 5, but not with osx.
libavcodec - What is ffmpeg, avcodec, x264? - Stack Overflow
https://stackoverflow.com/questions/16772558/what-is-ffmpeg-avcodec-x264
FFmpeg is a free software project that produces libraries and programs for handling multimedia data. The most notable parts of FFmpeg are libavcodec, an audio/video codec library used by several other projects, libavformat, an audio/video container mux and demux library, and the ffmpeg command line program for transcoding multimedia files.
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