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Add an option to specify FFmpeg encoding parameters #114

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Sep 18, 2024
Merged

Add an option to specify FFmpeg encoding parameters #114

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acd05e2
Add an option to specify FFmpeg encoding parameters
varsill Aug 22, 2024
badbeb4
Format the code
varsill Aug 23, 2024
6254372
Add checks for the overwritten parameters. Rename FFmpegOption to FFm…
varsill Aug 23, 2024
9b6941a
Modify the warning message
varsill Aug 23, 2024
68cb873
Update lib/membrane_h264_ffmpeg/encoder.ex
varsill Aug 23, 2024
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74 changes: 30 additions & 44 deletions c_src/membrane_h264_ffmpeg_plugin/encoder.c
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Original file line number Diff line number Diff line change
Expand Up @@ -8,72 +8,55 @@ void handle_destroy_state(UnifexEnv *env, State *state) {
}
}

static void set_x264_defaults(AVDictionary **params, char* preset) {
// Override FFmpeg defaults from https://github.com/mirror/x264/blob/eaa68fad9e5d201d42fde51665f2d137ae96baf0/encoder/encoder.c#L674
static void set_x264_defaults(AVDictionary **params, char *preset) {
// Override FFmpeg defaults from
// https://github.com/mirror/x264/blob/eaa68fad9e5d201d42fde51665f2d137ae96baf0/encoder/encoder.c#L674
av_dict_set(params, "qcomp", "0.6", 0);
av_dict_set(params, "me_range", "16", 0);
av_dict_set(params, "qdiff", "4", 0);
av_dict_set(params, "qmin", "0", 0);
av_dict_set(params, "qmax", "69", 0);
av_dict_set(params, "i_qfactor", "1.4", 0);
av_dict_set(params, "f_pb_factor", "1.3", 0);

if (strcmp(preset, "ultrafast") == 0)
{

if (strcmp(preset, "ultrafast") == 0) {
av_dict_set(params, "partitions", "none", 0);
av_dict_set(params, "subq", "0", 0);
}
else if (strcmp(preset, "superfast") == 0)
{
} else if (strcmp(preset, "superfast") == 0) {
av_dict_set(params, "partitions", "i8x8,i4x4", 0);
av_dict_set(params, "subq", "1", 0);
}
else if (strcmp(preset, "veryfast") == 0)
{
} else if (strcmp(preset, "veryfast") == 0) {
av_dict_set(params, "partitions", "p8x8,b8x8,i8x8,i4x4", 0);
av_dict_set(params, "subq", "2", 0);
}
else if (strcmp(preset, "faster") == 0)
{
} else if (strcmp(preset, "faster") == 0) {
av_dict_set(params, "partitions", "p8x8,b8x8,i8x8,i4x4", 0);
av_dict_set(params, "subq", "4", 0);
}
else if (strcmp(preset, "fast") == 0)
{
} else if (strcmp(preset, "fast") == 0) {
av_dict_set(params, "partitions", "p8x8,b8x8,i8x8,i4x4", 0);
av_dict_set(params, "subq", "6", 0);
}
else if (strcmp(preset, "medium") == 0)
{
} else if (strcmp(preset, "medium") == 0) {
av_dict_set(params, "partitions", "p8x8,b8x8,i8x8,i4x4", 0);
av_dict_set(params, "subq", "7", 0);
}
else if (strcmp(preset, "slow") == 0)
{
} else if (strcmp(preset, "slow") == 0) {
av_dict_set(params, "partitions", "all", 0);
av_dict_set(params, "subq", "8", 0);
}
else if (strcmp(preset, "slower") == 0)
{
} else if (strcmp(preset, "slower") == 0) {
av_dict_set(params, "partitions", "all", 0);
av_dict_set(params, "subq", "9", 0);
}
else if (strcmp(preset, "veryslow") == 0)
{
} else if (strcmp(preset, "veryslow") == 0) {
av_dict_set(params, "partitions", "all", 0);
av_dict_set(params, "subq", "10", 0);
}
else if (strcmp(preset, "placebo") == 0)
{
} else if (strcmp(preset, "placebo") == 0) {
av_dict_set(params, "partitions", "all", 0);
av_dict_set(params, "subq", "11", 0);
}
}
}


UNIFEX_TERM create(UnifexEnv *env, int width, int height, char *pix_fmt,
char *preset, char *tune, char *profile, int max_b_frames, int gop_size,
int timebase_num, int timebase_den, int crf, int sc_threshold) {
char *preset, char *tune, char *profile, int max_b_frames,
int gop_size, int timebase_num, int timebase_den, int crf,
int sc_threshold, ffmpeg_param *ffmpeg_params,
unsigned int ffmpeg_params_length) {
UNIFEX_TERM res;
AVDictionary *params = NULL;
State *state = unifex_alloc_state(env);
Expand Down Expand Up @@ -113,7 +96,7 @@ UNIFEX_TERM create(UnifexEnv *env, int width, int height, char *pix_fmt,

state->codec_ctx->time_base.num = timebase_num;
state->codec_ctx->time_base.den = timebase_den;

if (max_b_frames > -1) {
state->codec_ctx->max_b_frames = max_b_frames;
}
Expand All @@ -123,6 +106,10 @@ UNIFEX_TERM create(UnifexEnv *env, int width, int height, char *pix_fmt,

set_x264_defaults(&params, preset);

for (unsigned int i = 0; i < ffmpeg_params_length; i++) {
av_dict_set(&params, ffmpeg_params[i].key, ffmpeg_params[i].value, 0);
}

av_dict_set(&params, "preset", preset, 0);

if (strcmp("nil", profile) != 0) {
Expand Down Expand Up @@ -164,8 +151,7 @@ static int get_frames(UnifexEnv *env, AVFrame *frame,
int use_shm, State *state) {
AVPacket *pkt = av_packet_alloc();
UnifexPayload **frames = unifex_alloc((*max_frames) * sizeof(*frames));
int64_t *decoding_ts =
unifex_alloc((*max_frames) * sizeof(*decoding_ts));
int64_t *decoding_ts = unifex_alloc((*max_frames) * sizeof(*decoding_ts));
int64_t *presentation_ts =
unifex_alloc((*max_frames) * sizeof(*presentation_ts));

Expand All @@ -185,10 +171,10 @@ static int get_frames(UnifexEnv *env, AVFrame *frame,
if (*frame_cnt >= (*max_frames)) {
*max_frames *= 2;
frames = unifex_realloc(frames, (*max_frames) * sizeof(*frames));
decoding_ts = unifex_realloc(decoding_ts,
(*max_frames) * sizeof(*decoding_ts));
presentation_ts = unifex_realloc(presentation_ts,
(*max_frames) * sizeof(*presentation_ts));
decoding_ts =
unifex_realloc(decoding_ts, (*max_frames) * sizeof(*decoding_ts));
presentation_ts = unifex_realloc(
presentation_ts, (*max_frames) * sizeof(*presentation_ts));
}

decoding_ts[*frame_cnt] = pkt->dts;
Expand Down Expand Up @@ -228,7 +214,7 @@ UNIFEX_TERM encode(UnifexEnv *env, UnifexPayload *payload, int64_t pts,
frame->format = state->codec_ctx->pix_fmt;
frame->width = state->codec_ctx->width;
frame->height = state->codec_ctx->height;
if(keyframe_requested) {
if (keyframe_requested) {
frame->pict_type = AV_PICTURE_TYPE_I;
}
av_image_fill_arrays(frame->data, frame->linesize, payload->data,
Expand Down
10 changes: 9 additions & 1 deletion c_src/membrane_h264_ffmpeg_plugin/encoder.spec.exs
View file
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Original file line number Diff line number Diff line change
Expand Up @@ -2,6 +2,13 @@ module Membrane.H264.FFmpeg.Encoder.Native

state_type "State"

type(
ffmpeg_param :: %Membrane.H264.FFmpeg.Encoder.FFmpegParam{
key: string,
value: string
}
)

spec create(
width :: int,
height :: int,
Expand All @@ -14,7 +21,8 @@ spec create(
timebase_num :: int,
timebase_den :: int,
crf :: int,
sc_threshold :: int
sc_threshold :: int,
ffmpeg_params :: [ffmpeg_param]
) :: {:ok :: label, state} | {:error :: label, reason :: atom}

spec get_frame_size(state) :: {:ok :: label, frame_size :: int} | {:error :: label}
Expand Down
47 changes: 46 additions & 1 deletion lib/membrane_h264_ffmpeg/encoder.ex
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Original file line number Diff line number Diff line change
Expand Up @@ -12,6 +12,7 @@ defmodule Membrane.H264.FFmpeg.Encoder do
Please check `t:t/0` for available options.
"""
use Membrane.Filter
require Membrane.Logger, as: Logger
alias __MODULE__.Native
alias Membrane.Buffer
alias Membrane.H264
Expand Down Expand Up @@ -121,10 +122,30 @@ defmodule Membrane.H264.FFmpeg.Encoder do
See [this page](https://en.wikibooks.org/wiki/MeGUI/x264_Settings#scenecut) for more info.
""",
default: @default_sc_threshold
],
ffmpeg_params: [
spec: %{String.t() => String.t()},
description: """
A map with parameters that are passed to the encoder.

You can use options from: https://ffmpeg.org/ffmpeg-codecs.html#libx264_002c-libx264rgb
and https://ffmpeg.org/ffmpeg-codecs.html#Codec-Options
Remember not to overwrite options that are available as a separate module options
(like `sc_threshold` or `crf`).
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""",
default: %{}
]

defmodule FFmpegParam do
@moduledoc false
@enforce_keys [:key, :value]
defstruct @enforce_keys
end

@impl true
def handle_init(_ctx, opts) do
warn_if_ffmpeg_params_overwrite_module_options(opts.ffmpeg_params)

state =
opts
|> Map.put(:encoder_ref, nil)
Expand Down Expand Up @@ -165,6 +186,9 @@ defmodule Membrane.H264.FFmpeg.Encoder do
frames_per_second when is_integer(frames_per_second) -> {1, frames_per_second}
end

ffmpeg_params =
Enum.map(state.ffmpeg_params, fn {key, value} -> %FFmpegParam{key: key, value: value} end)

with buffers <- flush_encoder_if_exists(state),
{:ok, new_encoder_ref} <-
Native.create(
Expand All @@ -179,7 +203,8 @@ defmodule Membrane.H264.FFmpeg.Encoder do
timebase_num,
timebase_den,
state.crf,
state.sc_threshold
state.sc_threshold,
ffmpeg_params
) do
stream_format = create_new_stream_format(stream_format, state)
actions = buffers ++ [stream_format: stream_format]
Expand Down Expand Up @@ -257,4 +282,24 @@ defmodule Membrane.H264.FFmpeg.Encoder do
other -> other
end
end

defp warn_if_ffmpeg_params_overwrite_module_options(ffmpeg_params) do
params_to_options_mapping = %{
"crf" => "crf",
"preset" => "preset",
"profile" => "profile",
"tune" => "tune",
"max_b_frames" => "max_b_frames",
"g" => "gop_size",
"sc_threshold" => "sc_threshold"
}

Map.keys(ffmpeg_params)
|> Enum.filter(fn param_name -> params_to_options_mapping[param_name] != nil end)
|> Enum.each(fn param_name ->
Logger.warning(
"The parameter: `#{param_name}` you provided in the `ffmpeg_params` map overwrites the setting from the modules option: `#{params_to_options_mapping[param_name]}`."
)
end)
end
end
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