<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><p style="margin: 0px 0px 1em; padding: 0px; border: 0px; font-variant-ligatures: normal; font-variant-numeric: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: Arial, 'Helvetica Neue', Helvetica, sans-serif; vertical-align: baseline; clear: both; color: rgb(36, 39, 41); orphans: 2; widows: 2; background-color: rgb(255, 255, 255);" class="">I'm using ffmpeg libraries to decode, scale, and re-encode video within an MPEG transport stream. I've just recompiled from source to v3.3.2 and changed from the old avcodec_decode_video2() API to the new send/receive API.</p><p style="margin: 0px 0px 1em; padding: 0px; border: 0px; font-variant-ligatures: normal; font-variant-numeric: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: Arial, 'Helvetica Neue', Helvetica, sans-serif; vertical-align: baseline; clear: both; color: rgb(36, 39, 41); orphans: 2; widows: 2; background-color: rgb(255, 255, 255);" class="">Both the old and new APIs decode the video very slowly.</p><p style="margin: 0px 0px 1em; padding: 0px; border: 0px; font-variant-ligatures: normal; font-variant-numeric: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: Arial, 'Helvetica Neue', Helvetica, sans-serif; vertical-align: baseline; clear: both; color: rgb(36, 39, 41); orphans: 2; widows: 2; background-color: rgb(255, 255, 255);" class="">25 fps video = 1 frame every 40ms. However, I see 70 to 120ms per frame to decode. This is a file translator so need it to run <em style="margin: 0px; padding: 0px; border: 0px; font-variant-ligatures: inherit; font-variant-position: inherit; font-variant-caps: inherit; font-variant-numeric: inherit; font-variant-alternates: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit; vertical-align: baseline;" class="">faster</em> than real time.</p><p style="margin: 0px 0px 1em; padding: 0px; border: 0px; font-variant-ligatures: normal; font-variant-numeric: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: Arial, 'Helvetica Neue', Helvetica, sans-serif; vertical-align: baseline; clear: both; color: rgb(36, 39, 41); orphans: 2; widows: 2; background-color: rgb(255, 255, 255);" class="">The code outline is below. Anyone have any ideas on how to improve the decoding speed? There are other posts about the deprecated <code style="margin: 0px; padding: 1px 5px; border: 0px; font-style: inherit; font-variant-ligatures: inherit; font-variant-position: inherit; font-variant-caps: inherit; font-variant-numeric: inherit; font-variant-alternates: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 13px; line-height: inherit; font-family: Consolas, Menlo, Monaco, 'Lucida Console', 'Liberation Mono', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', 'Courier New', monospace, sans-serif; vertical-align: baseline; background-color: rgb(239, 240, 241); white-space: pre-wrap;" class="">avcodec_decode_video2()</code> being slow; none of those were resolved. The new API doesn't run any faster...</p><pre style="margin-top: 0px; margin-bottom: 1em; padding: 5px; border: 0px; font-variant-ligatures: normal; font-variant-numeric: inherit; font-stretch: inherit; font-size: 13px; line-height: inherit; font-family: Consolas, Menlo, Monaco, 'Lucida Console', 'Liberation Mono', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', 'Courier New', monospace, sans-serif; vertical-align: baseline; width: auto; max-height: 600px; overflow: auto; background-color: rgb(239, 240, 241); word-wrap: normal; color: rgb(36, 39, 41); orphans: 2; widows: 2;" class=""><code style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant-ligatures: inherit; font-variant-position: inherit; font-variant-caps: inherit; font-variant-numeric: inherit; font-variant-alternates: inherit; font-variant-east-asian: inherit; font-stretch: inherit; line-height: inherit; font-family: Consolas, Menlo, Monaco, 'Lucida Console', 'Liberation Mono', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', 'Courier New', monospace, sans-serif; vertical-align: baseline; white-space: inherit;" class="">gettimeofday(&tv1, NULL);
int rc = av_read_frame(pFormatContext, pESPacket);
gettimeofday(&tv2, NULL);
int ret = avcodec_send_packet(pDecoderContext, pESPacket);
if (ret < 0)
continue;
ret = avcodec_receive_frame(pDecoderContext, pFrameDec);
if (ret != 0)
{
printf("avcodec_receive_frame error: %d\n", ret);
continue;
}
gettimeofday(&tv3, 0);
u_long twoMinusOne = (tv2.tv_sec - tv1.tv_sec) * 1000000 + tv2.tv_usec - tv1.tv_usec;
u_long threeMinusTwo = (tv3.tv_sec - tv2.tv_sec) * 1000000 + tv3.tv_usec - tv2.tv_usec;
size_t pktSize = mPacketQueue.getTsPktListSize();
printf(" DECODE ReadFrame %lu usec, DecodeVideo %lu usec. mTsPacketList %u items\n", twoMinusOne, threeMinusTwo, pktSize);
transcodeFrame(pFrameDec);
// Scale and re-encode //
-- call avscale to downsample
-- call avcodec_encode_video2() to encode
</code></pre><p style="margin: 0px 0px 1em; padding: 0px; border: 0px; font-variant-ligatures: normal; font-variant-numeric: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: Arial, 'Helvetica Neue', Helvetica, sans-serif; vertical-align: baseline; clear: both; color: rgb(36, 39, 41); orphans: 2; widows: 2; background-color: rgb(255, 255, 255);" class=""><strong style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant-ligatures: inherit; font-variant-position: inherit; font-variant-caps: inherit; font-variant-numeric: inherit; font-variant-alternates: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit; vertical-align: baseline;" class="">Some Output</strong></p><pre style="margin-top: 0px; margin-bottom: 1em; padding: 5px; border: 0px; font-variant-ligatures: normal; font-variant-numeric: inherit; font-stretch: inherit; font-size: 13px; line-height: inherit; font-family: Consolas, Menlo, Monaco, 'Lucida Console', 'Liberation Mono', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', 'Courier New', monospace, sans-serif; vertical-align: baseline; width: auto; max-height: 600px; overflow: auto; background-color: rgb(239, 240, 241); word-wrap: normal; color: rgb(36, 39, 41); orphans: 2; widows: 2;" class=""><code style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant-ligatures: inherit; font-variant-position: inherit; font-variant-caps: inherit; font-variant-numeric: inherit; font-variant-alternates: inherit; font-variant-east-asian: inherit; font-stretch: inherit; line-height: inherit; font-family: Consolas, Menlo, Monaco, 'Lucida Console', 'Liberation Mono', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', 'Courier New', monospace, sans-serif; vertical-align: baseline; white-space: inherit;" class="">DECODE ReadFrame 6 usec, DecodeVideo 154273 usec.
Dump mpFrameEnc with DateTime:
AVFrame Info frame 720 X 406. PTS = 305700353 PKT_PTS = 305700353 Linesize[0]=720. Linesize[1]=360. Linesize[2]=360.
Time taken to ENCODE video frame = 3685 usec. Scaling time 4 usec
DECODE ReadFrame 8 usec, DecodeVideo 128203 usec.
Time taken to ENCODE video frame = 3724 usec. Scaling time 3 usec
DECODE ReadFrame 8 usec, DecodeVideo 69321 usec.
Time taken to ENCODE video frame = 3577 usec. Scaling time 3 usec
</code></pre><p style="margin: 0px 0px 1em; padding: 0px; border: 0px; font-variant-ligatures: normal; font-variant-numeric: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: Arial, 'Helvetica Neue', Helvetica, sans-serif; vertical-align: baseline; clear: both; color: rgb(36, 39, 41); orphans: 2; widows: 2; background-color: rgb(255, 255, 255);" class=""><strong style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant-ligatures: inherit; font-variant-position: inherit; font-variant-caps: inherit; font-variant-numeric: inherit; font-variant-alternates: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit; vertical-align: baseline;" class="">FFMPEG Version</strong></p><p style="margin: 0px 0px 1em; padding: 0px; border: 0px; font-variant-ligatures: normal; font-variant-numeric: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: Arial, 'Helvetica Neue', Helvetica, sans-serif; vertical-align: baseline; clear: both; color: rgb(36, 39, 41); orphans: 2; widows: 2; background-color: rgb(255, 255, 255);" class="">Tests running on core2 duo 3.2 GHz, 32-bit Centos 6.</p><pre style="margin-top: 0px; margin-bottom: 1em; padding: 5px; border: 0px; font-variant-ligatures: normal; font-variant-numeric: inherit; font-stretch: inherit; font-size: 13px; line-height: inherit; font-family: Consolas, Menlo, Monaco, 'Lucida Console', 'Liberation Mono', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', 'Courier New', monospace, sans-serif; vertical-align: baseline; width: auto; max-height: 600px; overflow: auto; background-color: rgb(239, 240, 241); word-wrap: normal; color: rgb(36, 39, 41); orphans: 2; widows: 2;" class=""><code style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant-ligatures: inherit; font-variant-position: inherit; font-variant-caps: inherit; font-variant-numeric: inherit; font-variant-alternates: inherit; font-variant-east-asian: inherit; font-stretch: inherit; line-height: inherit; font-family: Consolas, Menlo, Monaco, 'Lucida Console', 'Liberation Mono', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', 'Courier New', monospace, sans-serif; vertical-align: baseline; white-space: inherit;" class="">bin/ffmpeg
ffmpeg version 3.3.2 Copyright (c) 2000-2017 the FFmpeg developers
built with gcc 4.4.7 (GCC) 20120313 (Red Hat 4.4.7-11)
configuration: --prefix=/mnt/swdevel/DVStor/source_build/ext/ffmpeg-build --libdir=/mnt/swdevel/DVStor/source_build/ext/ffmpeg-build/lib3p_build --shlibdir=/mnt/swdevel/DVStor/source_build/ext/ffmpeg-build/lib3p_build --disable-static --enable-shared --disable-cuda --disable-cuvid --disable-nvenc --enable-libx264 --enable-gpl --extra-cflags=-I/usr/local/include/libx264
libavutil 55. 58.100 / 55. 58.100
libavcodec 57. 89.100 / 57. 89.100
libavformat 57. 71.100 / 57. 71.100
libavdevice 57. 6.100 / 57. 6.100
libavfilter 6. 82.100 / 6. 82.100
libswscale 4. 6.100 / 4. 6.100
libswresample 2. 7.100 / 2. 7.100
libpostproc 54. 5.100 / 54. 5.100
Hyper fast Audio and Video encoder</code></pre><div class=""><br class=""></div></body></html>