minimum encoding buffer size Used to avoid some checks during header writing.

Definition at line 624 of file avcodec.h.

Referenced by avcodec_encode_video(), encode_frame(), encode_nals(), encode_picture_ls(), flashsv2_encode_frame(), gif_encode_frame(), ljpeg_encode_frame(), prores_encode_frame(), svq1_encode_frame(), and xvid_encode_frame().

motion estimation type.

Enumerator:

ME_ZERO

no search, that is use 0,0 vector whenever one is needed

ME_FULL

ME_LOG

ME_PHODS

ME_EPZS

enhanced predictive zonal search

ME_X1

reserved for experiments

ME_HEX

hexagon based search

ME_UMH

uneven multi-hexagon search

ME_TESA

transformed exhaustive search algorithm

ME_ITER

iterative search

Definition at line 631 of file avcodec.h.

Find a registered encoder with a matching codec ID.

Parameters

id AVCodecID of the requested encoder

Returns

An encoder if one was found, NULL otherwise.

Examples:

decoding_encoding.c, muxing.c, transcode_aac.c, and transcoding.c.

Definition at line 2807 of file utils.c.

Referenced by add_stream(), audio_encode_example(), avcodec_get_name(), avcodec_get_type(), avcodec_open2(), avcodec_string(), choose_encoder(), compute_status(), config(), config_props(), estimate_best_b_count(), ffserver_opt_preset(), filter_codec_opts(), find_codec_or_die(), open_output_file(), read_ffserver_streams(), show_codecs(), transcode_init(), and video_encode_example().

Find a registered encoder with the specified name.

Parameters

name name of the requested encoder

Returns

An encoder if one was found, NULL otherwise.

Definition at line 2812 of file utils.c.

Referenced by find_codec_or_die(), opt_codec(), and show_help_codec().

Encode an audio frame from samples into buf.

Deprecated:

Use avcodec_encode_audio2 instead.

Note

The output buffer should be at least FF_MIN_BUFFER_SIZE bytes large. However, for codecs with avctx->frame_size equal to 0 (e.g. PCM) the user will know how much space is needed because it depends on the value passed in buf_size as described below. In that case a lower value can be used.

Parameters

avctx the codec context

[out] buf the output buffer

[in] buf_size the output buffer size

[in] samples the input buffer containing the samples The number of samples read from this buffer is frame_size*channels, both of which are defined in avctx. For codecs which have avctx->frame_size equal to 0 (e.g. PCM) the number of samples read from samples is equal to: buf_size * 8 / (avctx->channels * av_get_bits_per_sample(avctx->codec_id)) This also implies that av_get_bits_per_sample() must not return 0 for these codecs.

Returns

On error a negative value is returned, on success zero or the number of bytes used to encode the data read from the input buffer.

Definition at line 1885 of file utils.c.

Encode a frame of audio.

Takes input samples from frame and writes the next output packet, if available, to avpkt. The output packet does not necessarily contain data for the most recent frame, as encoders can delay, split, and combine input frames internally as needed.

Parameters

avctx codec context

avpkt output AVPacket. The user can supply an output buffer by setting avpkt->data and avpkt->size prior to calling the function, but if the size of the user-provided data is not large enough, encoding will fail. If avpkt->data and avpkt->size are set, avpkt->destruct must also be set. All other AVPacket fields will be reset by the encoder using av_init_packet(). If avpkt->data is NULL, the encoder will allocate it. The encoder will set avpkt->size to the size of the output packet.

If this function fails or produces no output, avpkt will be freed using av_free_packet() (i.e. avpkt->destruct will be called to free the user supplied buffer).

Parameters

[in] frame AVFrame containing the raw audio data to be encoded. May be NULL when flushing an encoder that has the CODEC_CAP_DELAY capability set. If CODEC_CAP_VARIABLE_FRAME_SIZE is set, then each frame can have any number of samples. If it is not set, frame->nb_samples must be equal to avctx->frame_size for all frames except the last. The final frame may be smaller than avctx->frame_size.

[out] got_packet_ptr This field is set to 1 by libavcodec if the output packet is non-empty, and to 0 if it is empty. If the function returns an error, the packet can be assumed to be invalid, and the value of got_packet_ptr is undefined and should not be used.

Returns

0 on success, negative error code on failure

Examples:

decoding_encoding.c, muxing.c, transcode_aac.c, and transcoding.c.

Definition at line 1751 of file utils.c.

Referenced by audio_encode_example(), avcodec_encode_audio(), do_audio_out(), encode_audio_frame(), encode_write_frame(), flush_encoders(), wrap(), and write_audio_frame().

Deprecated:

use avcodec_encode_video2() instead.

Encode a video frame from pict into buf. The input picture should be stored using a specific format, namely avctx.pix_fmt.

Parameters

avctx the codec context

[out] buf the output buffer for the bitstream of encoded frame

[in] buf_size the size of the output buffer in bytes

[in] pict the input picture to encode

Returns

On error a negative value is returned, on success zero or the number of bytes used from the output buffer.

Definition at line 1969 of file utils.c.

Referenced by filter(), and wrap().

Encode a frame of video.

Takes input raw video data from frame and writes the next output packet, if available, to avpkt. The output packet does not necessarily contain data for the most recent frame, as encoders can delay and reorder input frames internally as needed.

Parameters

avctx codec context

avpkt output AVPacket. The user can supply an output buffer by setting avpkt->data and avpkt->size prior to calling the function, but if the size of the user-provided data is not large enough, encoding will fail. All other AVPacket fields will be reset by the encoder using av_init_packet(). If avpkt->data is NULL, the encoder will allocate it. The encoder will set avpkt->size to the size of the output packet. The returned data (if any) belongs to the caller, he is responsible for freeing it.

If this function fails or produces no output, avpkt will be freed using av_free_packet() (i.e. avpkt->destruct will be called to free the user supplied buffer).

Parameters

[in] frame AVFrame containing the raw video data to be encoded. May be NULL when flushing an encoder that has the CODEC_CAP_DELAY capability set.

[out] got_packet_ptr This field is set to 1 by libavcodec if the output packet is non-empty, and to 0 if it is empty. If the function returns an error, the packet can be assumed to be invalid, and the value of got_packet_ptr is undefined and should not be used.

Returns

0 on success, negative error code on failure

Examples:

decoding_encoding.c, muxing.c, and transcoding.c.

Definition at line 2004 of file utils.c.

Referenced by avcodec_encode_video(), do_video_out(), encode_frame(), encode_write_frame(), filter_frame(), flush_encoders(), video_encode_example(), worker(), wrap(), and write_video_frame().

Definition at line 2085 of file utils.c.

Referenced by do_subtitle_out(), and wrap().