Видео и аудио кодирование: различия между версиями
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| (не показаны 22 промежуточные версии этого же участника) | |||
| Строка 1: | Строка 1: | ||
Главное, что нужно понять: | |||
* Видеофайлы(медиафайлы) содержат потоки(дорожки): видеопоток, аудиопоток, субтитры и другую информацию(например видеорегистраторы авто - gps координаты и время). | |||
* Потоки упакованы в контейнер: avi, mkv, mp4, wmv, mov... | |||
* Потоки сжаты кодеками: h264, mpeg, mp3, aac, vp8, vp9, av1... | |||
* Потоки можно извлекать и работать с ними отдельно. Добавлять сдвиги, удалять и пр. Зависит от контейнера и кодека. | |||
* При кодировании важна производительность декодирования. Чтобы компьютер пользователя не грелся. Или ноутбук или телефон не разряжались. Есть аппаратная поддержка кодеков для этих целей. Выбирайте кодеки с аппаратной поддержкой, иначе видеофайл будет воспроизводится центральным процессором. | |||
* Кодеки бывают свободные и несвободные(требуют уплаты роялти или платы за использование алгоритма) | |||
= Видео = | = Видео = | ||
== Ссылки == | |||
* https://trac.ffmpeg.org/wiki/HWAccelIntro | |||
* https://standaloneinstaller.com/blog/big-list-of-sample-videos-for-testers-124.html | |||
* https://file-examples.com/index.php/sample-video-files/ | |||
== Кодеки == | == Кодеки == | ||
<pre> | |||
$ mediainfo --Output=XML ./Terminator_Genezis.avi | |||
<?xml version="1.0" encoding="UTF-8"?> | |||
<Mediainfo | |||
version="0.1" | |||
ref="./Terminator_Genezis.avi"> | |||
<File> | |||
<track type="General"> | |||
<Complete_name>./Terminator_Genezis.avi</Complete_name> | |||
<Format>AVI</Format> | |||
<Format_Info>Audio Video Interleave</Format_Info> | |||
<File_size>1.46 GiB</File_size> | |||
<Duration>2h 5mn</Duration> | |||
<Overall_bit_rate>1 663 Kbps</Overall_bit_rate> | |||
<Writing_application>VirtualDubMod 1.5.10.3 | www.virtualdub-fr.org || (build 2550/release)</Writing_application> | |||
<Writing_library>VirtualDubMod build 2550/release</Writing_library> | |||
</track> | |||
<track type="Video"> | |||
<ID>0</ID> | |||
<Format>MPEG-4 Visual</Format> | |||
<Format_profile>Advanced Simple@L5</Format_profile> | |||
<Format_settings__BVOP>1</Format_settings__BVOP> | |||
<Format_settings__QPel>No</Format_settings__QPel> | |||
<Format_settings__GMC>No warppoints</Format_settings__GMC> | |||
<Format_settings__Matrix>Custom</Format_settings__Matrix> | |||
<Codec_ID>XVID</Codec_ID> | |||
<Codec_ID_Hint>XviD</Codec_ID_Hint> | |||
<Duration>2h 5mn</Duration> | |||
<Bit_rate>1 269 Kbps</Bit_rate> | |||
<Width>720 pixels</Width> | |||
<Height>304 pixels</Height> | |||
<Display_aspect_ratio>2.35:1</Display_aspect_ratio> | |||
<Frame_rate>23.976 (23976/1000) fps</Frame_rate> | |||
<Color_space>YUV</Color_space> | |||
<Chroma_subsampling>4:2:0</Chroma_subsampling> | |||
<Bit_depth>8 bits</Bit_depth> | |||
<Scan_type>Progressive</Scan_type> | |||
<Compression_mode>Lossy</Compression_mode> | |||
<Bits__Pixel_Frame_>0.242</Bits__Pixel_Frame_> | |||
<Stream_size>1.11 GiB (76%)</Stream_size> | |||
<Writing_library>XviD 73</Writing_library> | |||
</track> | |||
<track type="Audio"> | |||
<ID>1</ID> | |||
<Format>AC-3</Format> | |||
<Format_Info>Audio Coding 3</Format_Info> | |||
<Mode_extension>CM (complete main)</Mode_extension> | |||
<Format_settings__Endianness>Big</Format_settings__Endianness> | |||
<Codec_ID>2000</Codec_ID> | |||
<Duration>2h 5mn</Duration> | |||
<Bit_rate_mode>Constant</Bit_rate_mode> | |||
<Bit_rate>384 Kbps</Bit_rate> | |||
<Channel_s_>6 channels</Channel_s_> | |||
<Channel_positions>Front: L C R, Side: L R, LFE</Channel_positions> | |||
<Sampling_rate>48.0 KHz</Sampling_rate> | |||
<Frame_rate>31.250 fps (1536 spf)</Frame_rate> | |||
<Compression_mode>Lossy</Compression_mode> | |||
<Stream_size>345 MiB (23%)</Stream_size> | |||
<Alignment>Split accross interleaves</Alignment> | |||
<Interleave__duration>42 ms (1.00 video frame)</Interleave__duration> | |||
<Interleave__preload_duration>500 ms</Interleave__preload_duration> | |||
</track> | |||
</File> | |||
</Mediainfo> | |||
</pre> | |||
=== H.264 === | === H.264 === | ||
* [https://docs.nvidia.com/video-technologies/video-codec-sdk/ffmpeg-with-nvidia-gpu/ NVIDIA GPU hardware video encoding and decoding acceleration] | |||
<pre> | <pre> | ||
function transform_video_x264_aac_mp4($file_src,$file_dst,$width,$height,$vb,$ab,$tmp_dir="./") | |||
{ | |||
if (!file_exists($file_src)) return false; | |||
$X264_SUBQ="1"; | |||
$X264_FRAMEREF="1"; | |||
$X264_KEYINT="125"; | |||
$X264_THREADS="auto"; | |||
$X264_ME="hex"; | |||
$X264_BFRAMES="1"; | |||
$session_id=time(); | |||
$files_prefix = $tmp_dir."".$session_id; | |||
$mediainfo = $this->exec_program("mediainfo ".$file_src); | |||
preg_match("/General[\s\S]*?Format\s+\:\s+(.*)\s+/",$mediainfo,$m); | |||
$format = $m[1]; | |||
$format_profile = ""; | |||
if (preg_match("/General[\s\S]*?Format profile\s+\:\s+(.*)\s+/",$mediainfo,$m)) | |||
{ | |||
$format_profile = $m[1]; | |||
} | |||
$format_info = ""; | |||
if (preg_match("/General[\s\S]*?Format\/Info\s+\:\s+(.*)\s+/",$mediainfo,$m)) | |||
{ | |||
$format_info = $m[1]; | |||
} | |||
preg_match("/Video[\s\S]*?Frame rate\s+\:\s+(.*?)\s+fps/",$mediainfo,$m); | |||
//echo $format."\n"; | |||
$fps = $m[1]; | |||
if ($format_info == "Apple") | |||
{ | |||
// dump audio | |||
$this->exec_program("mplayer -quiet ".$file_src." -ao pcm:fast:file=".$files_prefix."_audiostream -vc dummy -vo null -channels 2"); | |||
// encode video from src | |||
$this->exec_program("mencoder ".$file_src." -ovc x264 -x264encopts bitrate=".$vb.":subq=".$X264_SUBQ.":frameref=".$X264_FRAMEREF.":me=".$X264_ME.":bframes=".$X264_BFRAMES.":threads=".$X264_THREADS.":keyint=".$X264_KEYINT." -of rawvideo -vf scale=".$width.":".$height." -ofps ".$fps." -nosound -o ".$files_prefix."_videostream.x264"); | |||
// encode audio | |||
$this->exec_program("ffmpeg -i ".$files_prefix."_audiostream -strict experimental -acodec aac -ab ".$ab." -ac 2 ".$files_prefix."_audiostream.aac"); | |||
$this->exec_program("MP4Box -new -add ".$files_prefix."_videostream.x264 -fps ".$fps." -add ".$files_prefix."_audiostream.aac ".$file_dst.""); | |||
$this->exec_program("rm -f ".$files_prefix."_*"); | |||
return true; | |||
} | |||
if ($format_profile == "QuickTime") | |||
{ | |||
// dump audio | |||
$this->exec_program("mplayer -quiet ".$file_src." -ao pcm:fast:file=".$files_prefix."_audiostream -vc dummy -vo null -channels 2"); | |||
// encode video from src | |||
$this->exec_program("mencoder ".$file_src." -ovc x264 -x264encopts bitrate=".$vb.":subq=".$X264_SUBQ.":frameref=".$X264_FRAMEREF.":me=".$X264_ME.":bframes=".$X264_BFRAMES.":threads=".$X264_THREADS.":keyint=".$X264_KEYINT." -of rawvideo -vf scale=".$width.":".$height." -ofps ".$fps." -nosound -o ".$files_prefix."_videostream.x264"); | |||
// encode audio | |||
$this->exec_program("ffmpeg -i ".$files_prefix."_audiostream -strict experimental -acodec aac -ab ".$ab." -ac 2 ".$files_prefix."_audiostream.aac"); | |||
$this->exec_program("MP4Box -new -add ".$files_prefix."_videostream.x264 -fps ".$fps." -add ".$files_prefix."_audiostream.aac ".$file_dst.""); | |||
$this->exec_program("rm -f ".$files_prefix."_*"); | |||
return true; | |||
} | |||
if ($format == "MPEG-4") | |||
{ | { | ||
$mpeg4tracks = $this->exec_program("MP4Box -info ".$file_src); | |||
$tracks = preg_split("/\n\n/",$mpeg4tracks); | |||
$videotrack = false; | |||
foreach($tracks as $track) | |||
$ | |||
$ | |||
{ | { | ||
if (preg_match("/Track # (\d+)[\s\S]*?Visual Stream/",$track,$m)) | |||
{ | |||
$videotrack = $m[1]; | |||
} | |||
} | } | ||
$audiotrack = false; | |||
foreach($tracks as $track) | |||
{ | { | ||
if (preg_match("/Track # (\d+)[\s\S]*?Audio (Stream|Track)/",$track,$m)) | |||
{ | { | ||
$audiotrack = $m[1]; | |||
} | } | ||
} | } | ||
if ($format == "AVI")//Format Audio Video Interleave | if ($videotrack === false) return false; | ||
$this->exec_program("MP4Box -raw ".$videotrack." ".$file_src." -out ".$files_prefix."_videostream"); | |||
if ($audiotrack !== false) $this->exec_program("MP4Box -raw ".$audiotrack." ".$file_src." -out ".$files_prefix."_audiostream"); | |||
$this->exec_program("mencoder ".$files_prefix."_videostream -ovc x264 -x264encopts bitrate=".$vb.":subq=".$X264_SUBQ.":frameref=".$X264_FRAMEREF.":me=".$X264_ME.":bframes=".$X264_BFRAMES.":threads=".$X264_THREADS.":keyint=".$X264_KEYINT." -of rawvideo -vf scale=".$width.":".$height." -ofps ".$fps." -nosound -o ".$files_prefix."_videostream.x264"); | |||
if ($audiotrack !== false) $this->exec_program("ffmpeg -i ".$files_prefix."_audiostream -strict experimental -acodec aac -ab ".$ab." -ac 2 ".$files_prefix."_audiostream.aac"); | |||
if ($audiotrack !== false) $this->exec_program("MP4Box -new -add ".$files_prefix."_videostream.x264 -fps ".$fps." -add ".$files_prefix."_audiostream.aac ".$file_dst.""); | |||
else $this->exec_program("MP4Box -new -add ".$files_prefix."_videostream.x264 -fps ".$fps." ".$file_dst.""); | |||
$this->exec_program("rm -f ".$files_prefix."_*"); | |||
return true; | |||
} | |||
if ($format == "AVI")//Format Audio Video Interleave | |||
{ | |||
// dump audio | |||
$this->exec_program("mplayer -quiet ".$file_src." -ao pcm:fast:file=".$files_prefix."_audiostream -vc dummy -vo null -channels 2"); | |||
// encode video from src | |||
$this->exec_program("mencoder ".$file_src." -ovc x264 -x264encopts bitrate=".$vb.":subq=".$X264_SUBQ.":frameref=".$X264_FRAMEREF.":me=".$X264_ME.":bframes=".$X264_BFRAMES.":threads=".$X264_THREADS.":keyint=".$X264_KEYINT." -of rawvideo -vf scale=".$width.":".$height." -ofps ".$fps." -nosound -o ".$files_prefix."_videostream.x264"); | |||
// encode audio | |||
$this->exec_program("ffmpeg -i ".$files_prefix."_audiostream -strict experimental -acodec aac -ab ".$ab." -ac 2 ".$files_prefix."_audiostream.aac"); | |||
$this->exec_program("MP4Box -new -add ".$files_prefix."_videostream.x264 -fps ".$fps." -add ".$files_prefix."_audiostream.aac ".$file_dst.""); | |||
$this->exec_program("rm -f ".$files_prefix."_*"); | |||
return true; | |||
} | |||
if ($format == "Windows Media")//WMV | |||
{ | |||
// dump audio | |||
$this->exec_program("mplayer -quiet ".$file_src." -ao pcm:fast:file=".$files_prefix."_audiostream -vc dummy -vo null -channels 2"); | |||
// encode video from src | |||
$this->exec_program("mencoder ".$file_src." -ovc x264 -x264encopts bitrate=".$vb.":subq=".$X264_SUBQ.":frameref=".$X264_FRAMEREF.":me=".$X264_ME.":bframes=".$X264_BFRAMES.":threads=".$X264_THREADS.":keyint=".$X264_KEYINT." -of rawvideo -vf scale=".$width.":".$height." -ofps ".$fps." -nosound -o ".$files_prefix."_videostream.x264"); | |||
// encode audio | |||
$this->exec_program("ffmpeg -i ".$files_prefix."_audiostream -strict experimental -acodec aac -ab ".$ab." -ac 2 ".$files_prefix."_audiostream.aac"); | |||
$this->exec_program("MP4Box -new -add ".$files_prefix."_videostream.x264 -fps ".$fps." -add ".$files_prefix."_audiostream.aac ".$file_dst.""); | |||
$this->exec_program("rm -f ".$files_prefix."_*"); | |||
return true; | |||
} | |||
if ($format == "Flash Video")//FLV | |||
{ | |||
// dump audio | |||
$this->exec_program("mplayer -quiet ".$file_src." -ao pcm:fast:file=".$files_prefix."_audiostream -vc dummy -vo null -channels 2"); | |||
// encode video from src | |||
$this->exec_program("mencoder ".$file_src." -ovc x264 -x264encopts bitrate=".$vb.":subq=".$X264_SUBQ.":frameref=".$X264_FRAMEREF.":me=".$X264_ME.":bframes=".$X264_BFRAMES.":threads=".$X264_THREADS.":keyint=".$X264_KEYINT." -of rawvideo -vf scale=".$width.":".$height." -ofps ".$fps." -nosound -o ".$files_prefix."_videostream.x264"); | |||
// encode audio | |||
$this->exec_program("ffmpeg -i ".$files_prefix."_audiostream -strict experimental -acodec aac -ab ".$ab." -ac 2 ".$files_prefix."_audiostream.aac"); | |||
$this->exec_program("MP4Box -new -add ".$files_prefix."_videostream.x264 -fps ".$fps." -add ".$files_prefix."_audiostream.aac ".$file_dst.""); | |||
$this->exec_program("rm -f ".$files_prefix."_*"); | |||
return true; | |||
} | } | ||
return false; | |||
} | |||
</pre> | </pre> | ||
=== VP9 === | === VP9 === | ||
* https://trac.ffmpeg.org/wiki/Encode/VP9 | * https://trac.ffmpeg.org/wiki/Encode/VP9 | ||
* https://www.youtube.com/watch?v=K6JshvblIcM | * https://www.youtube.com/watch?v=K6JshvblIcM | ||
* https://ru.wikipedia.org/wiki/VP9 | * https://ru.wikipedia.org/wiki/VP9 | ||
=== AV1 === | |||
* https://habr.com/ru/post/442020/ | |||
== Контейнеры == | == Контейнеры == | ||
Текущая версия от 23:31, 4 мая 2021
Главное, что нужно понять:
- Видеофайлы(медиафайлы) содержат потоки(дорожки): видеопоток, аудиопоток, субтитры и другую информацию(например видеорегистраторы авто - gps координаты и время).
- Потоки упакованы в контейнер: avi, mkv, mp4, wmv, mov...
- Потоки сжаты кодеками: h264, mpeg, mp3, aac, vp8, vp9, av1...
- Потоки можно извлекать и работать с ними отдельно. Добавлять сдвиги, удалять и пр. Зависит от контейнера и кодека.
- При кодировании важна производительность декодирования. Чтобы компьютер пользователя не грелся. Или ноутбук или телефон не разряжались. Есть аппаратная поддержка кодеков для этих целей. Выбирайте кодеки с аппаратной поддержкой, иначе видеофайл будет воспроизводится центральным процессором.
- Кодеки бывают свободные и несвободные(требуют уплаты роялти или платы за использование алгоритма)
Видео
Ссылки
- https://trac.ffmpeg.org/wiki/HWAccelIntro
- https://standaloneinstaller.com/blog/big-list-of-sample-videos-for-testers-124.html
- https://file-examples.com/index.php/sample-video-files/
Кодеки
$ mediainfo --Output=XML ./Terminator_Genezis.avi
<?xml version="1.0" encoding="UTF-8"?>
<Mediainfo
version="0.1"
ref="./Terminator_Genezis.avi">
<File>
<track type="General">
<Complete_name>./Terminator_Genezis.avi</Complete_name>
<Format>AVI</Format>
<Format_Info>Audio Video Interleave</Format_Info>
<File_size>1.46 GiB</File_size>
<Duration>2h 5mn</Duration>
<Overall_bit_rate>1 663 Kbps</Overall_bit_rate>
<Writing_application>VirtualDubMod 1.5.10.3 | www.virtualdub-fr.org || (build 2550/release)</Writing_application>
<Writing_library>VirtualDubMod build 2550/release</Writing_library>
</track>
<track type="Video">
<ID>0</ID>
<Format>MPEG-4 Visual</Format>
<Format_profile>Advanced Simple@L5</Format_profile>
<Format_settings__BVOP>1</Format_settings__BVOP>
<Format_settings__QPel>No</Format_settings__QPel>
<Format_settings__GMC>No warppoints</Format_settings__GMC>
<Format_settings__Matrix>Custom</Format_settings__Matrix>
<Codec_ID>XVID</Codec_ID>
<Codec_ID_Hint>XviD</Codec_ID_Hint>
<Duration>2h 5mn</Duration>
<Bit_rate>1 269 Kbps</Bit_rate>
<Width>720 pixels</Width>
<Height>304 pixels</Height>
<Display_aspect_ratio>2.35:1</Display_aspect_ratio>
<Frame_rate>23.976 (23976/1000) fps</Frame_rate>
<Color_space>YUV</Color_space>
<Chroma_subsampling>4:2:0</Chroma_subsampling>
<Bit_depth>8 bits</Bit_depth>
<Scan_type>Progressive</Scan_type>
<Compression_mode>Lossy</Compression_mode>
<Bits__Pixel_Frame_>0.242</Bits__Pixel_Frame_>
<Stream_size>1.11 GiB (76%)</Stream_size>
<Writing_library>XviD 73</Writing_library>
</track>
<track type="Audio">
<ID>1</ID>
<Format>AC-3</Format>
<Format_Info>Audio Coding 3</Format_Info>
<Mode_extension>CM (complete main)</Mode_extension>
<Format_settings__Endianness>Big</Format_settings__Endianness>
<Codec_ID>2000</Codec_ID>
<Duration>2h 5mn</Duration>
<Bit_rate_mode>Constant</Bit_rate_mode>
<Bit_rate>384 Kbps</Bit_rate>
<Channel_s_>6 channels</Channel_s_>
<Channel_positions>Front: L C R, Side: L R, LFE</Channel_positions>
<Sampling_rate>48.0 KHz</Sampling_rate>
<Frame_rate>31.250 fps (1536 spf)</Frame_rate>
<Compression_mode>Lossy</Compression_mode>
<Stream_size>345 MiB (23%)</Stream_size>
<Alignment>Split accross interleaves</Alignment>
<Interleave__duration>42 ms (1.00 video frame)</Interleave__duration>
<Interleave__preload_duration>500 ms</Interleave__preload_duration>
</track>
</File>
</Mediainfo>
H.264
function transform_video_x264_aac_mp4($file_src,$file_dst,$width,$height,$vb,$ab,$tmp_dir="./")
{
if (!file_exists($file_src)) return false;
$X264_SUBQ="1";
$X264_FRAMEREF="1";
$X264_KEYINT="125";
$X264_THREADS="auto";
$X264_ME="hex";
$X264_BFRAMES="1";
$session_id=time();
$files_prefix = $tmp_dir."".$session_id;
$mediainfo = $this->exec_program("mediainfo ".$file_src);
preg_match("/General[\s\S]*?Format\s+\:\s+(.*)\s+/",$mediainfo,$m);
$format = $m[1];
$format_profile = "";
if (preg_match("/General[\s\S]*?Format profile\s+\:\s+(.*)\s+/",$mediainfo,$m))
{
$format_profile = $m[1];
}
$format_info = "";
if (preg_match("/General[\s\S]*?Format\/Info\s+\:\s+(.*)\s+/",$mediainfo,$m))
{
$format_info = $m[1];
}
preg_match("/Video[\s\S]*?Frame rate\s+\:\s+(.*?)\s+fps/",$mediainfo,$m);
//echo $format."\n";
$fps = $m[1];
if ($format_info == "Apple")
{
// dump audio
$this->exec_program("mplayer -quiet ".$file_src." -ao pcm:fast:file=".$files_prefix."_audiostream -vc dummy -vo null -channels 2");
// encode video from src
$this->exec_program("mencoder ".$file_src." -ovc x264 -x264encopts bitrate=".$vb.":subq=".$X264_SUBQ.":frameref=".$X264_FRAMEREF.":me=".$X264_ME.":bframes=".$X264_BFRAMES.":threads=".$X264_THREADS.":keyint=".$X264_KEYINT." -of rawvideo -vf scale=".$width.":".$height." -ofps ".$fps." -nosound -o ".$files_prefix."_videostream.x264");
// encode audio
$this->exec_program("ffmpeg -i ".$files_prefix."_audiostream -strict experimental -acodec aac -ab ".$ab." -ac 2 ".$files_prefix."_audiostream.aac");
$this->exec_program("MP4Box -new -add ".$files_prefix."_videostream.x264 -fps ".$fps." -add ".$files_prefix."_audiostream.aac ".$file_dst."");
$this->exec_program("rm -f ".$files_prefix."_*");
return true;
}
if ($format_profile == "QuickTime")
{
// dump audio
$this->exec_program("mplayer -quiet ".$file_src." -ao pcm:fast:file=".$files_prefix."_audiostream -vc dummy -vo null -channels 2");
// encode video from src
$this->exec_program("mencoder ".$file_src." -ovc x264 -x264encopts bitrate=".$vb.":subq=".$X264_SUBQ.":frameref=".$X264_FRAMEREF.":me=".$X264_ME.":bframes=".$X264_BFRAMES.":threads=".$X264_THREADS.":keyint=".$X264_KEYINT." -of rawvideo -vf scale=".$width.":".$height." -ofps ".$fps." -nosound -o ".$files_prefix."_videostream.x264");
// encode audio
$this->exec_program("ffmpeg -i ".$files_prefix."_audiostream -strict experimental -acodec aac -ab ".$ab." -ac 2 ".$files_prefix."_audiostream.aac");
$this->exec_program("MP4Box -new -add ".$files_prefix."_videostream.x264 -fps ".$fps." -add ".$files_prefix."_audiostream.aac ".$file_dst."");
$this->exec_program("rm -f ".$files_prefix."_*");
return true;
}
if ($format == "MPEG-4")
{
$mpeg4tracks = $this->exec_program("MP4Box -info ".$file_src);
$tracks = preg_split("/\n\n/",$mpeg4tracks);
$videotrack = false;
foreach($tracks as $track)
{
if (preg_match("/Track # (\d+)[\s\S]*?Visual Stream/",$track,$m))
{
$videotrack = $m[1];
}
}
$audiotrack = false;
foreach($tracks as $track)
{
if (preg_match("/Track # (\d+)[\s\S]*?Audio (Stream|Track)/",$track,$m))
{
$audiotrack = $m[1];
}
}
if ($videotrack === false) return false;
$this->exec_program("MP4Box -raw ".$videotrack." ".$file_src." -out ".$files_prefix."_videostream");
if ($audiotrack !== false) $this->exec_program("MP4Box -raw ".$audiotrack." ".$file_src." -out ".$files_prefix."_audiostream");
$this->exec_program("mencoder ".$files_prefix."_videostream -ovc x264 -x264encopts bitrate=".$vb.":subq=".$X264_SUBQ.":frameref=".$X264_FRAMEREF.":me=".$X264_ME.":bframes=".$X264_BFRAMES.":threads=".$X264_THREADS.":keyint=".$X264_KEYINT." -of rawvideo -vf scale=".$width.":".$height." -ofps ".$fps." -nosound -o ".$files_prefix."_videostream.x264");
if ($audiotrack !== false) $this->exec_program("ffmpeg -i ".$files_prefix."_audiostream -strict experimental -acodec aac -ab ".$ab." -ac 2 ".$files_prefix."_audiostream.aac");
if ($audiotrack !== false) $this->exec_program("MP4Box -new -add ".$files_prefix."_videostream.x264 -fps ".$fps." -add ".$files_prefix."_audiostream.aac ".$file_dst."");
else $this->exec_program("MP4Box -new -add ".$files_prefix."_videostream.x264 -fps ".$fps." ".$file_dst."");
$this->exec_program("rm -f ".$files_prefix."_*");
return true;
}
if ($format == "AVI")//Format Audio Video Interleave
{
// dump audio
$this->exec_program("mplayer -quiet ".$file_src." -ao pcm:fast:file=".$files_prefix."_audiostream -vc dummy -vo null -channels 2");
// encode video from src
$this->exec_program("mencoder ".$file_src." -ovc x264 -x264encopts bitrate=".$vb.":subq=".$X264_SUBQ.":frameref=".$X264_FRAMEREF.":me=".$X264_ME.":bframes=".$X264_BFRAMES.":threads=".$X264_THREADS.":keyint=".$X264_KEYINT." -of rawvideo -vf scale=".$width.":".$height." -ofps ".$fps." -nosound -o ".$files_prefix."_videostream.x264");
// encode audio
$this->exec_program("ffmpeg -i ".$files_prefix."_audiostream -strict experimental -acodec aac -ab ".$ab." -ac 2 ".$files_prefix."_audiostream.aac");
$this->exec_program("MP4Box -new -add ".$files_prefix."_videostream.x264 -fps ".$fps." -add ".$files_prefix."_audiostream.aac ".$file_dst."");
$this->exec_program("rm -f ".$files_prefix."_*");
return true;
}
if ($format == "Windows Media")//WMV
{
// dump audio
$this->exec_program("mplayer -quiet ".$file_src." -ao pcm:fast:file=".$files_prefix."_audiostream -vc dummy -vo null -channels 2");
// encode video from src
$this->exec_program("mencoder ".$file_src." -ovc x264 -x264encopts bitrate=".$vb.":subq=".$X264_SUBQ.":frameref=".$X264_FRAMEREF.":me=".$X264_ME.":bframes=".$X264_BFRAMES.":threads=".$X264_THREADS.":keyint=".$X264_KEYINT." -of rawvideo -vf scale=".$width.":".$height." -ofps ".$fps." -nosound -o ".$files_prefix."_videostream.x264");
// encode audio
$this->exec_program("ffmpeg -i ".$files_prefix."_audiostream -strict experimental -acodec aac -ab ".$ab." -ac 2 ".$files_prefix."_audiostream.aac");
$this->exec_program("MP4Box -new -add ".$files_prefix."_videostream.x264 -fps ".$fps." -add ".$files_prefix."_audiostream.aac ".$file_dst."");
$this->exec_program("rm -f ".$files_prefix."_*");
return true;
}
if ($format == "Flash Video")//FLV
{
// dump audio
$this->exec_program("mplayer -quiet ".$file_src." -ao pcm:fast:file=".$files_prefix."_audiostream -vc dummy -vo null -channels 2");
// encode video from src
$this->exec_program("mencoder ".$file_src." -ovc x264 -x264encopts bitrate=".$vb.":subq=".$X264_SUBQ.":frameref=".$X264_FRAMEREF.":me=".$X264_ME.":bframes=".$X264_BFRAMES.":threads=".$X264_THREADS.":keyint=".$X264_KEYINT." -of rawvideo -vf scale=".$width.":".$height." -ofps ".$fps." -nosound -o ".$files_prefix."_videostream.x264");
// encode audio
$this->exec_program("ffmpeg -i ".$files_prefix."_audiostream -strict experimental -acodec aac -ab ".$ab." -ac 2 ".$files_prefix."_audiostream.aac");
$this->exec_program("MP4Box -new -add ".$files_prefix."_videostream.x264 -fps ".$fps." -add ".$files_prefix."_audiostream.aac ".$file_dst."");
$this->exec_program("rm -f ".$files_prefix."_*");
return true;
}
return false;
}
VP9
- https://trac.ffmpeg.org/wiki/Encode/VP9
- https://www.youtube.com/watch?v=K6JshvblIcM
- https://ru.wikipedia.org/wiki/VP9