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minor changes to media player pipeline (improved performance?)

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brunoherbelin
2021-03-31 15:40:02 +02:00
parent 0b845591f9
commit 8bef575e8b
1 changed files with 16 additions and 6 deletions
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22
MediaPlayer.cpp
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@@ -204,13 +204,16 @@ void MediaPlayer::open(string path)
void MediaPlayer::execute_open()
{
// Create gstreamer pipeline :
// " uridecodebin uri=file:///path_to_file/filename.mp4 ! videoconvert ! appsink "
// equivalent to gst-launch-1.0 uridecodebin uri=file:///path_to_file/filename.mp4 ! videoconvert ! ximagesink
string description = "uridecodebin name=decoder uri=" + uri_ + " ! ";
// "uridecodebin uri=file:///path_to_file/filename.mp4 ! videoconvert ! appsink "
// equivalent to command line
// "gst-launch-1.0 uridecodebin uri=file:///path_to_file/filename.mp4 ! videoconvert ! ximagesink"
string description = "uridecodebin name=decoder uri=" + uri_ + " ! queue max-size-time=0 ! ";
// NB: queue adds some control over the buffer, thereby limiting the frame delay. zero size means no buffering
// string description = "uridecodebin name=decoder uri=" + uri_ + " decoder. ! ";
// description += "audioconvert ! autoaudiosink decoder. ! ";
// video deinterlacing method
// video deinterlacing method (if media is interlaced)
// tomsmocomp (0) – Motion Adaptive: Motion Search
// greedyh (1) – Motion Adaptive: Advanced Detection
// greedyl (2) – Motion Adaptive: Simple Detection
@@ -220,12 +223,19 @@ void MediaPlayer::execute_open()
if (media_.interlaced)
description += "deinterlace method=2 ! ";
// video convertion chroma-resampler
// video convertion algorithm (should only do colorspace conversion, no scaling)
// chroma-resampler:
// Duplicates the samples when upsampling and drops when downsampling 0
// Uses linear interpolation 1 (default)
// Uses cubic interpolation 2
// Uses sinc interpolation 3
description += "videoconvert chroma-resampler=2 n-threads=2 ! ";
// dither:
// no dithering 0
// propagate rounding errors downwards 1
// Dither with floyd-steinberg error diffusion 2
// Dither with Sierra Lite error diffusion 3
// ordered dither using a bayer pattern 4 (default)
description += "videoconvert chroma-resampler=1 dither=0 ! "; // fast
// hack to compensate for lack of PTS in gif animations
if (media_.codec_name.compare("image/gst-libav-gif") == 0){