在Windows上使用FFMPEG从图像stream式传输video

我写了一个模拟摄像机的程序，将输出转换成videostream。 该程序需要能够在Windows上运行。 系统中有两个组件：

1. 相机模拟器。 模拟相机的C ++程序。 它使用windows copy命令每隔0.1秒复制一个预先生成的帧（即PNG文件）到目标path./target/target_image.png
2. videostream。 使用FFmpeg，它会从复制的图像中创build一个videostream。 使用以下命令运行FFmpeg： ffmpeg -loop 1 -i ./target/target_image.png -r 10 -vcodec mpeg4 -f mpegts udp://127.0.0.1:1234

当一起运行整个事情时，它会正常工作几秒钟，直到ffmpeg暂停。 以debugging模式运行时，这是一个日志：

 ffmpeg version N-52458-gaa96439 Copyright (c) 2000-2013 the FFmpeg developers built on Apr 24 2013 22:19:32 with gcc 4.8.0 (GCC) configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetype --enable-libgsm --enable-libilbc --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib libavutil 52. 27.101 / 52. 27.101 libavcodec 55. 6.100 / 55. 6.100 libavformat 55. 3.100 / 55. 3.100 libavdevice 55. 0.100 / 55. 0.100 libavfilter 3. 60.101 / 3. 60.101 libswscale 2. 2.100 / 2. 2.100 libswresample 0. 17.102 / 0. 17.102 libpostproc 52. 3.100 / 52. 3.100 Splitting the commandline. Reading option '-loop' ... matched as AVOption 'loop' with argument '1'. Reading option '-i' ... matched as input file with argument './target/target_image.png'. Reading option '-r' ... matched as option 'r' (set frame rate (Hz value, fraction or abbreviation)) with argument '10'. Reading option '-vcodec' ... matched as option 'vcodec' (force video codec ('copy' to copy stream)) with argument 'mpeg4'. Reading option '-f' ... matched as option 'f' (force format) with argument 'mpegts'. Reading option 'udp://127.0.0.1:1234' ... matched as output file. Reading option '-loglevel' ... matched as option 'loglevel' (set logging level) with argument 'debug'. Finished splitting the commandline. Parsing a group of options: global . Applying option loglevel (set logging level) with argument debug. Successfully parsed a group of options. Parsing a group of options: input file ./target/target_image.png. Successfully parsed a group of options. Opening an input file: ./target/target_image.png. [AVIOContext @ 02678840] Statistics: 234307 bytes read, 0 seeks [AVIOContext @ 02678840] Statistics: 221345 bytes read, 0 seeks Last message repeated 1 times [AVIOContext @ 02678840] Statistics: 226329 bytes read, 0 seeks Last message repeated 2 times [AVIOContext @ 02678840] Statistics: 228676 bytes read, 0 seeks Last message repeated 2 times [AVIOContext @ 02678840] Statistics: 230685 bytes read, 0 seeks Last message repeated 2 times [AVIOContext @ 02678840] Statistics: 232697 bytes read, 0 seeks Last message repeated 5 times [AVIOContext @ 02678840] Statistics: 234900 bytes read, 0 seeks Last message repeated 2 times [AVIOContext @ 02678840] Statistics: 236847 bytes read, 0 seeks [image2 @ 02677ac0] Probe buffer size limit of 5000000 bytes reached Input #0, image2, from './target/target_image.png': Duration: 00:00:00.04, start: 0.000000, bitrate: N/A Stream #0:0, 22, 1/25: Video: png, rgb24, 1274x772 [SAR 1:1 DAR 637:386], 1/25, 25 fps, 25 tbr, 25 tbn, 25 tbc Successfully opened the file. Parsing a group of options: output file udp://127.0.0.1:1234. Applying option r (set frame rate (Hz value, fraction or abbreviation)) with argument 10. Applying option vcodec (force video codec ('copy' to copy stream)) with argument mpeg4. Applying option f (force format) with argument mpegts. Successfully parsed a group of options. Opening an output file: udp://127.0.0.1:1234. Successfully opened the file. [graph 0 input from stream 0:0 @ 02769280] Setting 'video_size' to value '1274x772' [graph 0 input from stream 0:0 @ 02769280] Setting 'pix_fmt' to value '2' [graph 0 input from stream 0:0 @ 02769280] Setting 'time_base' to value '1/25' [graph 0 input from stream 0:0 @ 02769280] Setting 'pixel_aspect' to value '1/1' [graph 0 input from stream 0:0 @ 02769280] Setting 'sws_param' to value 'flags=2' [graph 0 input from stream 0:0 @ 02769280] Setting 'frame_rate' to value '25/1' [graph 0 input from stream 0:0 @ 02769280] w:1274 h:772 pixfmt:rgb24 tb:1/25 fr:25/1 sar:1/1 sws_param:flags=2 [format @ 02768ba0] compat: called with args=[yuv420p] [format @ 02768ba0] Setting 'pix_fmts' to value 'yuv420p' [auto-inserted scaler 0 @ 02768740] Setting 'w' to value '0' [auto-inserted scaler 0 @ 02768740] Setting 'h' to value '0' [auto-inserted scaler 0 @ 02768740] Setting 'flags' to value '0x4' [auto-inserted scaler 0 @ 02768740] w:0 h:0 flags:'0x4' interl:0 [format @ 02768ba0] auto-inserting filter 'auto-inserted scaler 0' between the filter 'Parsed_null_0' and the filter 'format' [AVFilterGraph @ 026772c0] query_formats: 4 queried, 3 merged, 1 already done, 0 delayed [auto-inserted scaler 0 @ 02768740] w:1274 h:772 fmt:rgb24 sar:1/1 -> w:1274 h:772 fmt:yuv420p sar:1/1 flags:0x4 [mpeg4 @ 02785020] detected 4 logical cores [mpeg4 @ 02785020] intra_quant_bias = 0 inter_quant_bias = -64 [mpegts @ 0277da40] muxrate VBR, pcr every 1 pkts, sdt every 200, pat/pmt every 40 pkts Output #0, mpegts, to 'udp://127.0.0.1:1234': Metadata: encoder : Lavf55.3.100 Stream #0:0, 0, 1/90000: Video: mpeg4, yuv420p, 1274x772 [SAR 1:1 DAR 637:386], 1/10, q=2-31, 200 kb/s, 90k tbn, 10 tbc Stream mapping: Stream #0:0 -> #0:0 (png -> mpeg4) Press [q] to stop, [?] for help *** drop! Last message repeated 10 times frame= 11 fps=0.0 q=4.0 size= 118kB time=00:00:01.10 bitrate= 875.1kbits/s dup=0 drop=11 Statistics: 242771 bytes read, 0 seeks [AVIOContext @ 02674a60] Statistics: 246525 bytes read, 0 seeks *** drop! [AVIOContext @ 02674a60] Statistics: 230678 bytes read, 0 seeks [AVIOContext @ 02674a60] Statistics: 244023 bytes read, 0 seeks *** drop! [AVIOContext @ 02674a60] Statistics: 246389 bytes read, 0 seeks *** drop! [AVIOContext @ 02674a60] Statistics: 224478 bytes read, 0 seeks [AVIOContext @ 02674a60] Statistics: 228013 bytes read, 0 seeks *** drop! [image2 @ 02677ac0] Could not open file : ./target/target_image.png ./target/target_image.png: Input/output error [output stream 0:0 @ 02768c20] EOF on sink link output stream 0:0:default. No more output streams to write to, finishing. frame= 164 fps= 17 q=31.0 Lsize= 959kB time=00:00:16.40 bitrate= 478.9kbits/s dup=0 drop=240 video:869kB audio:0kB subtitle:0 global headers:0kB muxing overhead 10.285235% 404 frames successfully decoded, 0 decoding errors [AVIOContext @ 026779c0] Statistics: 0 seeks, 746 writeouts 

在我看来，在读取和写入同一文件之间存在某种冲突。 另外有趣的是，在Linux上（同时用cpreplacecopy ），程序工作得很好。

有人可以build议一种方法来解决这个问题？ 只要逻辑工作stream程保持不变，替代解决scheme也是可以接受的。

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 #include "stdafx.h" #include "windows.h" #include "iostream" #include "stdio.h" using namespace std; #pragma warning (disable : 4996) int _tmain(int argc, _TCHAR* argv[]) { int count; int times = 2200; FILE *pPipe; FILE * pFile; long lSize; char * buffer; size_t result; // open a pipe to FFmpeg if( (pPipe = _popen( "ffmpeg -re -f image2pipe -vcodec mjpeg -i - -vcodec h264 -r 10 -f mpegts udp://127.0.0.1:1234", "wb")) == NULL ) {exit( 1 );} for ( count = 1; count <= times; count++) { char filename[40]; sprintf(&filename[0], ".\\images\\image-%07d.jpg", count); pFile = fopen ( filename , "rb" ); if (pFile==NULL) {fputs ("File error",stderr); exit (2);} // obtain file size: fseek (pFile , 0 , SEEK_END); lSize = ftell (pFile); rewind (pFile); // allocate memory to contain the whole file: buffer = (char*) malloc (sizeof(char)*lSize); if (buffer == NULL) {fputs ("Memory error",stderr); exit (3);} // copy the file into the buffer: result = fread (buffer, 1, lSize, pFile); if (result != lSize) {fputs ("Reading error",stderr); exit (4);} // write to pipe fwrite(buffer, 1, lSize, pPipe); fflush(pPipe); // clean fclose (pFile); free (buffer); // Sleep(100); } // return 0; }