Videobearbeitung mit den FFmpeg libraries

Externe Webseiten

FFmpeg Documentation
Das Encodingwissen Deutsche Seite zum Encoding mit x264 und MPEG-4 (etwas holprig)

Main Data Structures of FFmpeg

AVFormatContext Format I/O context. Wird erzeugt mit avformat_open_input(), avformat_open_output()

Type	Name	Beschreibung
unsigned int	nb_streams	Number of elements in AVFormatContext.streams.
AVStream**	streams	A list of all streams in the file
void*	priv_data	format-spezifische Parameter, Anzeige mit av_opt_show2(ofmt_ctx→priv_data,0,0xfffff,0);

AVStream: Stream structure (für jeden Video- und Audio-stream). Hauptfelder

Type	Name	Beschreibung
int	index	stream index in AVFormatContext
int	id	Format-specific stream ID.
AVRational	time_base:	This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented. (=1/90000)
int64_t	start_time	Decoding: pts of the first frame of the stream in presentation order, in stream time base.
int64_t	duration	Decoding: duration of the stream, in stream time base.
int64_t	nb_frames	number of frames in this stream if known or 0

AVCodecContext main external API structure.
You can use AVOptions (av_opt* / av_set/get*()) to access these fields from user applications. The name string for AVOptions options matches the associated command line parameter name and can be found in libavcodec/options_table.h
zB: av_opt_set(enc_ctx→priv_data, "crf", "28.0", 0); setzt für h264-Codec den Parameter 'crf' auf den float-Wert 28.0 ("crf=0: lossless, 23-28: safe values for x264-codec, a change of crf += 6 results in approx. half file size") av_opt_show2(enc_ctx→priv_data,0,0xfffff,0); zeigt alle options auf stdout (s.u.)

Type	Name	Beschreibung
enum	codec_type, codec_id	Video/Audio-Type, Codec-ID
void*	priv_data	codec-spezifische Parameter (zB für h264: crf, threads), s.u.
int	ticks_per_frame	For some codecs, the time base is closer to the field rate than the frame rate. Most notably, H.264 and MPEG-2 specify time_base as half of frame duration if no telecine is used ... Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
int	gop_size	video: the number of pictures in a group of pictures, or 0 for intra_only (optimal = 24) alle 0.96 Sek I-Frame, default 'keyint=250': reduziert byte rate (zB Hachiko: 240kB/s -> 202kB/s), schlecht für Tests
int	channels	audio: number of audio channels
enum	sample_fmt	audio sample format
int	frame_size	Number of samples per channel in an audio frame.
enum	field_order	Video interlaced/progressive: enum AVFieldOrder, 1 = progressive = AV_FIELD_PROGRESSIVE, 2 = AV_FIELD_TT (zB Servus-TV) = Top coded first, top displayed first,...

AVPacket: stores compressed data. It is typically exported by demuxers and then passed as input to decoders, or received as output from encoders and then passed to muxers. For video, it should typically contain one compressed frame. For audio it may contain several compressed frames. Encoders are allowed to output empty packets, with no compressed data, containing only side data (e.g. to update some stream parameters at the end of encoding).
Haupt-Felder:

Type	Name	Beschreibung
int64_t	pts	Presentation timestamp in AVStream→time_base units; the time at which the decompressed packet will be presented to the user
int64_t	dts	Decompression timestamp in AVStream→time_base units; the time at which the packet is decompressed. Für Audio gilt immer 'dts = pts'
int64_t	duration	Duration of this packet in AVStream→time_base units, 0 if unknown.
int	size, stream_index	size in bytes, index in AVFormatContext.streams
int	flags	AV_PKT_FLAG_KEY = 0x1: packet contains keyframe (I-Frame) AV_PKT_FLAG_DISCARD = 0x4: Flag is used to discard packets which are required to maintain valid decoder state but are not required for output and should be dropped after decoding.
int64_t	pos	byte position in stream, -1 if unknown

AVFrame This structure describes decoded (raw) audio or video data
Haupt-Felder:

Type	Name	Beschreibung
uint8_t*	data [AV_NUM_DATA_POINTERS]	pointer to the picture/channel planes.
int	linesize [AV_NUM_DATA_POINTERS]	For video, size in bytes of each picture line
uint8_t**	extended_data	pointers to the data planes/channel
int	nb_samples	number of audio samples (per channel) described by this frame
int	key_frame	1 → keyframe, 0 → not
int	pict_type	0=?, 1=I, 2=P, 3=B

Audio-Formate

Hauptformate

AC3: 31.25 fr/s mit 32msec, sample_rate = 48kHz = 1536 samples/fr,
channel_layout = 5.1 = 1551 = AV_CH_LAYOUT_5POINT1_BACK (6 channels: L R C LFE, Ls, Lr) oder Stereo: AV_CH_LAYOUT_STEREO
AAC: 46.875 fr/s mit 20.33msec, sample_rate = 48kHz = 1024 samples/fr

Das resampling ac3 → aac ist wegen der verschiedenen packet_duration kompliziert
AVSampleFormat asf = AVCodecContext→sample_fmt; beschreibt Aufbau von AVFrame.extended_data (nchannel data planes)

'planar' bedeutet, daß jeder audio channel in einer separaten data plane gespeichert ist,
'packed' alle interleaved in plane=0

AV_SAMPLE_FMT_S16 = signed 16 bits (packed)
AV_SAMPLE_FMT_FLTP = float, planar

Ablauf 'transcoding'

Beispiel 'transcoding-wolfk.c'. Übernommen aus 'transcoding.c', aber ohne filter!

avformat_open_input(&ifmt_ctx, filename, NULL, NULL)
avformat_open_output(&ofmt_ctx, filename, NULL, NULL)

StreamContext

userdef. class wird instanziert für Video/Audio:

typedef struct StreamContext {                                   
    AVCodecContext *dec_ctx, *enc_ctx; // input, output
    AVFrame *dec_frame;                // aktuelles Frame
};

crf = 'constant rate factor' def in X264Context
crf=0: lossless, 23-28: safe values for x264-codec, a change of crf += 6 results in approx. half file size

if (encoder->id == AV_CODEC_ID_H264) { // = 27
   // av_opt_show2(enc_ctx->priv_data,0,0xfffff,0); // zeigt alle options auf stdout
   // X264Context *x4 = enc_ctx->priv_data; // aus 'libx264.c'
   av_opt_set(enc_ctx->priv_data, "crf", "28.0", 0); // *****************
}

send/receive encoding and decoding API overview

(Aus FFmpeg) The API is very similar for encoding/decoding and audio/video, and works as follows:

Set up and open the AVCodecContext as usual.
Send valid input:
- For decoding, call
```
avcodec_send_packet()
```
  to give the decoder raw compressed data in an
```
AVPacket
```
  .
- For encoding, call
```
avcodec_send_frame()
```
  to give the encoder an
```
AVFrame
```
  containing uncompressed audio or video.
In both cases, it is recommended that AVPackets and AVFrames are refcounted, or libavcodec might have to copy the input data. (libavformat always returns refcounted AVPackets, and av_frame_get_buffer() allocates refcounted AVFrames.)
Receive output in a loop. Periodically call one of the avcodec_receive_*() functions and process their output:
- For decoding, call
```
avcodec_receive_frame()
```
  . On success, it will return an
```
AVFrame
```
  containing uncompressed audio or video data.
- For encoding, call
```
avcodec_receive_packet()
```
  . On success, it will return an
```
AVPacket
```
  with a compressed frame.
Repeat this call until it returns AVERROR(EAGAIN) or an error. The AVERROR(EAGAIN) return value means that new input data is required to return new output. In this case, continue with sending input. For each input frame/packet, the codec will typically return 1 output frame/packet, but it can also be 0 or more than 1.

At the beginning of decoding or encoding, the codec might accept multiple input frames/packets without returning a frame, until its internal buffers are filled. This situation is handled transparently if you follow the steps outlined above.

In theory, sending input can result in EAGAIN - this should happen only if not all output was received. You can use this to structure alternative decode or encode loops other than the one suggested above. For example, you could try sending new input on each iteration, and try to receive output if that returns EAGAIN.

End of stream situations. These require "flushing" (aka draining) the codec, as the codec might buffer multiple frames or packets internally for performance or out of necessity (consider B-frames). This is handled as follows:

Instead of valid input, send NULL to the avcodec_send_packet() (decoding) or avcodec_send_frame() (encoding) functions. This will enter draining mode.
Call avcodec_receive_frame() (decoding) or avcodec_receive_packet() (encoding) in a loop until AVERROR_EOF is returned. The functions will not return AVERROR(EAGAIN), unless you forgot to enter draining mode.
Before decoding can be resumed again, the codec has to be reset with avcodec_flush_buffers().

Implementierung: Decoding Loop

while (1) {                                                       // read all packets aus input 
    if (ret = av_read_frame(ifmt_ctx, packet) < 0) break;         // EOF
    stream_index = packet->stream_index;                          // Video oder Audio
    StreamContext *stream = &stream_ctx[stream_index];            
    av_packet_rescale_ts(packet, ifmt_ctx->streams[stream_index]->time_base, stream->dec_ctx->time_base);
    ret = avcodec_send_packet(stream->dec_ctx, packet);           // send-receive-loop für decoding
    while (ret >= 0) {
	ret = avcodec_receive_frame(stream->dec_ctx, stream->dec_frame);
	if (ret == AVERROR_EOF || ret == AVERROR(EAGAIN))  break;
	else if (ret < 0)  goto end;
	stream->dec_frame->pts = stream->dec_frame->best_effort_timestamp;
        ret = wolfk_encode_write_frame(stream->dec_frame, stream_index);  // **** encoding loop (s.u.) ******
	if (ret < 0)   goto end;
    }
}

Implementierung: Encoding Loop

static int wolfk_encode_write_frame(AVFrame *frame, unsigned int stream_index) { // ohne filter!!
  StreamContext *stream = &stream_ctx[stream_index];
  AVCodecContext *enc_ctx = stream->enc_ctx;                           // Video oder Audio
  AVPacket *enc_pkt = av_packet_alloc();
  if (frame) {
    if (stream_index == videoStream) {                                 // ---- für Cut pict_type setzen --- 
      if (frame->pict_type == AV_PICTURE_TYPE_B) frame->pict_type = AV_PICTURE_TYPE_P; // AV_PICTURE_TYPE_NONE;
      // frame->pict_type = AV_PICTURE_TYPE_I;  // alles I-Frames: funzt!
    } 
  } else  fprintf(stderr,"flushing encoder %d\n",stream_index);
  int ret = avcodec_send_frame(enc_ctx, frame);                         //  send-receive-loop
  /* frame = containing the raw audio or video frame to be encoded. 
     It can be NULL, in which case it is considered a flush packet. This signals the end of the stream. 
     If the encoder still has packets buffered, it will return them after this call. 
     Once flushing mode has been entered, additional flush packets are ignored, and sending frames will return AVERROR_EOF.
   */
  if (ret < 0) return ret; // EOF
  while (ret >= 0) {       // 1 oder mehrere packets empfangen *** Das sind gepufferte packets !!! *** 
    ret = avcodec_receive_packet(enc_ctx, enc_pkt);
    /* Returns 0 on success, otherwise negative error code: 
       AVERROR(EAGAIN): output is not available in the current state - user must try to send input 
       AVERROR_EOF: the encoder has been fully flushed, and there will be no more output packets 
       AVERROR(EINVAL): codec not opened, or it is a decoder 
       other errors: legitimate encoding errors 
     */
    if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF) return 0;    // weiter input-loop
    enc_pkt->stream_index = stream_index;                          // packet ready, prepare  for muxing 
    av_packet_rescale_ts(enc_pkt, enc_ctx->time_base, ofmt_ctx->streams[stream_index]->time_base);
    ret = av_interleaved_write_frame(ofmt_ctx, enc_pkt);           // mux encoded frame     
  }
  av_packet_unref(enc_pkt);
  return ret;
}

Beispiel: Packet-Input von TS-File

  Input #0, mpegts, from '/home/minidlna/Test-Message.m2t':
  Duration: 03:15:09.03, start: 19562.565178, bitrate: 5833 kb/s
  Program 50019 
  Program 50021 
    Stream #0:0[0x1a73]: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p(tv, bt709, top first), 1920x1080 [SAR 1:1 DAR 16:9], 25 fps, 50 tbr, 90k tbn, 50 tbc
    Stream #0:1[0x1a74](deu): Audio: ac3 ([6][0][0][0] / 0x0006), 48000 Hz, 5.1(side), fltp, 384 kb/s
    Stream #0:2[0x1a76](deu): Subtitle: dvb_teletext ([6][0][0][0] / 0x0006)
  
**** Frame size = 1920 x 1080 (8,294,400 byte) bit_rate=5,833,496 frame_rate=25.000 time_base=1/90,000=1.11111e-05 ticksperframe=2 videoStream=0
total    start_time= 19,562.565s duration=11,709s bitrate=5,833,496  audio_preload=0ms
951305 packets 585424 videopkt 12390 I-Frames

    i        dts                    pts           duration    size flag    pos
  0 0 +0.200=1,760,648,866 +0.400=1,760,666,866 0.020=1,800 41,062 0     2,256  Video 20ms
  1 0 +0.220=1,760,650,666 +0.420=1,760,668,666 0.020=1,800  4,279 0    48,880   ""
  2 0 +0.240=1,760,652,466 +0.320=1,760,659,666 0.020=1,800  7,434 0    54,520   ""
  3 0 +0.260=1,760,654,266 +0.340=1,760,661,466 0.020=1,800  2,761 0    62,416
  4 0 +0.280=1,760,656,066 +0.280=1,760,656,066 0.020=1,800  4,048 0    65,800
  5 0 +0.300=1,760,657,866 +0.300=1,760,657,866 0.020=1,800  2,322 0    71,252
  6 0 +0.320=1,760,659,666 +0.360=1,760,663,266 0.020=1,800  4,357 0    73,696   ""
  7 1 -0.000=1,760,630,866 -0.000=1,760,630,866 0.032=2,880  1,536 1    33,652  Audio 32ms
  8 1 +0.032=1,760,633,746 +0.032=1,760,633,746 0.032=2,880  1,536 1        -1   ""
  9 1 +0.064=1,760,636,626 +0.064=1,760,636,626 0.032=2,880  1,536 1        -1
 10 1 +0.096=1,760,639,506 +0.096=1,760,639,506 0.032=2,880  1,536 1        -1
 11 0 +0.340=1,760,661,466 +0.380=1,760,665,066 0.020=1,800  2,426 0    78,208
 12 0 +0.360=1,760,663,266 +0.560=1,760,681,266 0.020=1,800 39,672 0    81,028
 13 0 +0.380=1,760,665,066 +0.580=1,760,683,066 0.020=1,800  8,313 0   127,088
 14 0 +0.400=1,760,666,866 +0.480=1,760,674,066 0.020=1,800  8,568 0   135,736
 15 0 +0.420=1,760,668,666 +0.500=1,760,675,866 0.020=1,800  3,230 0   146,452
 16 0 +0.440=1,760,670,466 +0.440=1,760,670,466 0.020=1,800  4,170 0   149,836
 17 0 +0.460=1,760,672,266 +0.460=1,760,672,266 0.020=1,800  2,373 0   154,160
 18 0 +0.480=1,760,674,066 +0.520=1,760,677,666 0.020=1,800  3,982 0   156,792
 19 0 +0.500=1,760,675,866 +0.540=1,760,679,466 0.020=1,800  2,315 0   162,244
 20 1 +0.128=1,760,642,386 +0.128=1,760,642,386 0.032=2,880  1,536 1        -1
 21 1 +0.160=1,760,645,266 +0.160=1,760,645,266 0.032=2,880  1,536 1   122,764
 22 1 +0.192=1,760,648,146 +0.192=1,760,648,146 0.032=2,880  1,536 1        -1
 23 1 +0.224=1,760,651,026 +0.224=1,760,651,026 0.032=2,880  1,536 1        -1
 24 1 +0.256=1,760,653,906 +0.256=1,760,653,906 0.032=2,880  1,536 1        -1
 25 0 +0.520=1,760,677,666 +0.720=1,760,695,666 0.020=1,800 39,670 0   164,688
 26 0 +0.540=1,760,679,466 +0.740=1,760,697,466 0.020=1,800  6,232 0   208,868
 27 0 +0.560=1,760,681,266 +0.640=1,760,688,466 0.020=1,800  9,111 0   217,140
 28 0 +0.580=1,760,683,066 +0.660=1,760,690,266 0.020=1,800  3,214 0   226,916
 29 0 +0.600=1,760,684,866 +0.600=1,760,684,866 0.020=1,800  4,704 0   231,052
 30 0 +0.620=1,760,686,666 +0.620=1,760,686,666 0.020=1,800  2,526 0   237,068
 31 0 +0.640=1,760,688,466 +0.680=1,760,692,066 0.020=1,800  4,506 0   239,700
 32 1 +0.288=1,760,656,786 +0.288=1,760,656,786 0.032=2,880  1,536 1        -1
 33 1 +0.320=1,760,659,666 +0.320=1,760,659,666 0.032=2,880  1,536 1   216,200
 34 1 +0.352=1,760,662,546 +0.352=1,760,662,546 0.032=2,880  1,536 1        -1
 35 1 +0.384=1,760,665,426 +0.384=1,760,665,426 0.032=2,880  1,536 1        -1
 36 1 +0.416=1,760,668,306 +0.416=1,760,668,306 0.032=2,880  1,536 1        -1
 37 0 +0.660=1,760,690,266 +0.700=1,760,693,866 0.020=1,800  2,479 0   244,400
 38 0 +0.680=1,760,692,066 +0.880=1,760,710,066 0.020=1,800 90,498 1   247,032 *** 1. I-Frame
 39 0 +0.700=1,760,693,867 +0.900=1,760,711,867 0.020=1,800  6,438 0   350,432
 40 0 +0.720=1,760,695,667 +0.800=1,760,702,867 0.020=1,800  7,008 0   357,200
 41 0 +0.740=1,760,697,467 +0.820=1,760,704,667 0.020=1,800  2,688 0   366,224
 42 0 +0.760=1,760,699,267 +0.760=1,760,699,267 0.020=1,800  3,891 0   369,044
....

libx264 AVOptions

  -preset            <string>     E..V..... Set the encoding preset (cf. x264 --fullhelp) (default "medium")
  -tune              <string>     E..V..... Tune the encoding params (cf. x264 --fullhelp)
  -profile           <string>     E..V..... Set profile restrictions (cf. x264 --fullhelp) 
  -fastfirstpass     <boolean>    E..V..... Use fast settings when encoding first pass (default true)
  -level             <string>     E..V..... Specify level (as defined by Annex A)
  -passlogfile       <string>     E..V..... Filename for 2 pass stats
  -wpredp            <string>     E..V..... Weighted prediction for P-frames
  -a53cc             <boolean>    E..V..... Use A53 Closed Captions (if available) (default true)
  -x264opts          <string>     E..V..... x264 options
  -crf               <float>      E..V..... Select the quality for constant quality mode (from -1 to FLT_MAX) (default -1)
  -crf_max           <float>      E..V..... In CRF mode, prevents VBV from lowering quality beyond this point. (from -1 to FLT_MAX) (default -1)
  -qp                <int>        E..V..... Constant quantization parameter rate control method (from -1 to INT_MAX) (default -1)
  -aq-mode           <int>        E..V..... AQ method (from -1 to INT_MAX) (default -1)
     none                         E..V.....
     variance                     E..V..... Variance AQ (complexity mask)
     autovariance                 E..V..... Auto-variance AQ
     autovariance-biased          E..V..... Auto-variance AQ with bias to dark scenes
  -aq-strength       <float>      E..V..... AQ strength. Reduces blocking and blurring in flat and textured areas. (from -1 to FLT_MAX) (default -1)
  -psy               <boolean>    E..V..... Use psychovisual optimizations. (default auto)
  -psy-rd            <string>     E..V..... Strength of psychovisual optimization, in <psy-rd>:<psy-trellis> format.
  -rc-lookahead      <int>        E..V..... Number of frames to look ahead for frametype and ratecontrol (from -1 to INT_MAX) (default -1)
  -weightb           <boolean>    E..V..... Weighted prediction for B-frames. (default auto)
  -weightp           <int>        E..V..... Weighted prediction analysis method. (from -1 to INT_MAX) (default -1)
     none                         E..V.....
     simple                       E..V.....
     smart                        E..V.....
  -ssim              <boolean>    E..V..... Calculate and print SSIM stats. (default auto)
  -intra-refresh     <boolean>    E..V..... Use Periodic Intra Refresh instead of IDR frames. (default auto)
  -bluray-compat     <boolean>    E..V..... Bluray compatibility workarounds. (default auto)
  -b-bias            <int>        E..V..... Influences how often B-frames are used (from INT_MIN to INT_MAX) (default INT_MIN)
  -b-pyramid         <int>        E..V..... Keep some B-frames as references. (from -1 to INT_MAX) (default -1)
     none                         E..V.....
     strict                       E..V..... Strictly hierarchical pyramid
     normal                       E..V..... Non-strict (not Blu-ray compatible)
  -mixed-refs        <boolean>    E..V..... One reference per partition, as opposed to one reference per macroblock (default auto)
  -8x8dct            <boolean>    E..V..... High profile 8x8 transform. (default auto)
  -fast-pskip        <boolean>    E..V..... (default auto)
  -aud               <boolean>    E..V..... Use access unit delimiters. (default auto)
  -mbtree            <boolean>    E..V..... Use macroblock tree ratecontrol. (default auto)
  -deblock           <string>     E..V..... Loop filter parameters, in <alpha:beta> form.
  -cplxblur          <float>      E..V..... Reduce fluctuations in QP (before curve compression) (from -1 to FLT_MAX) (default -1)
  -partitions        <string>     E..V..... A comma-separated list of partitions to consider. Possible values: p8x8, p4x4, b8x8, i8x8, i4x4, none, all
  -direct-pred       <int>        E..V..... Direct MV prediction mode (from -1 to INT_MAX) (default -1)
     none                         E..V.....
     spatial                      E..V.....
     temporal                     E..V.....
     auto                         E..V.....
  -slice-max-size    <int>        E..V..... Limit the size of each slice in bytes (from -1 to INT_MAX) (default -1)
  -stats             <string>     E..V..... Filename for 2 pass stats
  -nal-hrd           <int>        E..V..... Signal HRD information (requires vbv-bufsize; cbr not allowed in .mp4) (from -1 to INT_MAX) (default -1)
     none                         E..V.....
     vbr                          E..V.....
     cbr                          E..V.....
  -avcintra-class    <int>        E..V..... AVC-Intra class 50/100/200 (from -1 to 200) (default -1)
  -me_method         <int>        E..V..... Set motion estimation method (from -1 to 4) (default -1)
     dia                          E..V.....
     hex                          E..V.....
     umh                          E..V.....
     esa                          E..V.....
     tesa                         E..V.....
  -motion-est        <int>        E..V..... Set motion estimation method (from -1 to 4) (default -1)
     dia                          E..V.....
     hex                          E..V.....
     umh                          E..V.....
     esa                          E..V.....
     tesa                         E..V.....
  -forced-idr        <boolean>    E..V..... If forcing keyframes, force them as IDR frames. (default false)
  -coder             <int>        E..V..... Coder type (from -1 to 1) (default default)
     default                      E..V.....
     cavlc                        E..V.....
     cabac                        E..V.....
     vlc                          E..V.....
     ac                           E..V.....
  -b_strategy        <int>        E..V..... Strategy to choose between I/P/B-frames (from -1 to 2) (default -1)
  -chromaoffset      <int>        E..V..... QP difference between chroma and luma (from INT_MIN to INT_MAX) (default -1)
  -sc_threshold      <int>        E..V..... Scene change threshold (from INT_MIN to INT_MAX) (default -1)
  -noise_reduction   <int>        E..V..... Noise reduction (from INT_MIN to INT_MAX) (default -1)
  -x264-params       <string>     E..V..... Override the x264 configuration using a :-separated list of key=value parameters
[libx264 @ 0x5638e67c5f80] using SAR=1/1
[libx264 @ 0x5638e67c5f80] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 0x5638e67c5f80] profile High, level 4.2
[libx264 @ 0x5638e67c5f80] 264 - core 155 r2917 0a84d98 - H.264/MPEG-4 AVC codec - Copyleft 2003-2018 - http://www.videolan.org/x264.html - options:
  cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1
  chroma_qp_offset=-2 threads=34 lookahead_threads=5 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0
  direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=28.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4
  ip_ratio=1.40 aq=1:1.00

Letzte Änderung: wolfk.wk@wolfk-wk.de