php - popen 延迟后返回输出？

Question

我正在使用 popen() 执行 FFMPEG 以获得过程的结果。我这样做的主要原因是我可以流式传输恒定输出并构建进度条。

问题是流程开始了，我收到了一些初始信息。然而，直到该过程完成后，其余信息才会出现。因此，从本质上讲，在流程进行时间隔出现的其余输出(进度输出)在流程之前被延迟，并且在流程完成后立即全部出现，这是无用的。

我需要输出不断出现，这样我才能更新进度条。如果我将 2>&1 更改为 2> stderr.txt，该文本文件始终接收输出，但我想在 php 中接收，因为许多进程可能正在运行。 有人对解决这个问题有什么想法吗？似乎没有人能弄清楚这一点……这让我发疯了!如果有人帮助我解决这个问题(并实际解决它)，我将开始悬赏，然后接受他们的回答。

$handle = popen ('/usr/local/bin/ffmpeg -i /home/g/Desktop/cave.wmv -deinterlace -acodec libfaac -ab 96k -ar 44100 -vcodec libx264 -s 480x320 -f flv /home/g/Desktop/file.flv 2>&1', 'r');
if ($handle) {

    while(! feof ($handle)) {

echo $read = fgets ($handle);

ob_flush();
    flush();
    } 
    pclose ($handle);
}

输出

    ffmpeg version git-N-30561-g6700aa8, Copyright (c) 2000-2011 the FFmpeg developers built on Jun 5 2011 21:10:26 with gcc 4.5.2 configuration: --enable-gpl --enable-version3 --enable-nonfree --enable-postproc --enable-libfaac --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libvorbis --enable-libx264 --enable-libxvid --enable-x11grab libavutil 51. 4. 0 / 51. 4. 0 libavcodec 53. 6. 1 / 53. 6. 1 libavformat 53. 2. 0 / 53. 2. 0 libavdevice 53. 1. 1 / 53. 1. 1 libavfilter 2. 13. 0 / 2. 13. 0 libswscale 0. 14. 1 / 0. 14. 1 libpostproc 51. 2. 0 / 51. 2. 0 Seems stream 0 codec frame rate differs from container frame rate: 1000.00 (1000/1) -> 29.97 (30000/1001) Input #0, asf, from '/home/geoff/Desktop/cave.wmv': Metadata: WMFSDKVersion : 11.0.5721.5145 WMFSDKNeeded : 0.0.0.0000 IsVBR : 0 Duration: 00:01:37.93, bitrate: 263 kb/s Stream #0.0(eng): Video: vc1 (Advanced), yuv420p, 320x240, 256 kb/s, PAR 1:1 DAR 4:3, 29.97 tbr, 1k tbn, 1k tbc [buffer @ 0xacae200] w:320 h:240 pixfmt:yuv420p tb:1/1000000 sar:1/1 sws_param: [scale @ 0xacbc120] w:320 h:240 fmt:yuv420p -> w:480 h:320 fmt:yuv420p flags:0x4 [libx264 @ 0xacbb7e0] Default settings detected, using medium profile [libx264 @ 0xacbb7e0] using SAR=1/1 [libx264 @ 0xacbb7e0] using cpu capabilities: MMX2 SSE2Fast SSSE3 FastShuffle Cache64 [libx264 @ 0xacbb7e0] profile High, level 2.1 [libx264 @ 0xacbb7e0] 264 - core 115 r1995 c1e60b9 - H.264/MPEG-4 AVC codec - Copyleft 2003-2011 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=1 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00 Output #0, flv, to '/home/geoff/Desktop/file.flv': Metadata: WMFSDKVersion : 11.0.5721.5145 WMFSDKNeeded : 0.0.0.0000 IsVBR : 0 encoder : Lavf53.2.0 Stream #0.0(eng): Video: libx264, yuv420p, 480x320 [PAR 1:1 DAR 3:2], q=2-31, 200 kb/s, 1k tbn, 29.97 tbc Stream mapping: Stream #0.0 -> #0.0 Press [q] to stop, [?] for help 

**THEN AFTER THE PROCESS IS COMPLETE OUTPUTS**

frame= 49 fps= 0 q=29.0 size= 17kB time=00:00:00.23 bitrate= 593.9kbits/s frame= 58 fps= 52 q=29.0 size= 29kB time=00:00:00.53 bitrate= 448.9kbits/s frame= 71 fps= 44 q=29.0 size= 48kB time=00:00:00.96 bitrate= 405.7kbits/s frame= 85 fps= 39 q=29.0 size= 69kB time=00:00:01.43 bitrate= 393.2kbits/s frame= 104 fps= 38 q=29.0 size= 90kB time=00:00:02.06 bitrate= 358.3kbits/s frame= 117 fps= 36 q=29.0 size= 104kB time=00:00:02.50 bitrate= 339.5kbits/s frame= 134 fps= 36 q=29.0 size= 119kB time=00:00:03.06 bitrate= 317.6kbits/s frame= 153 fps= 36 q=29.0 size= 137kB time=00:00:03.70 bitrate= 303.5kbits/s frame= 167 fps= 35 q=29.0 size= 153kB time=00:00:04.17 bitrate= 300.1kbits/s frame= 185 fps= 35 q=29.0 size= 173kB time=00:00:04.77 bitrate= 296.8kbits/s frame= 201 fps= 35 q=29.0 size= 199kB time=00:00:05.30 bitrate= 306.8kbits/s frame= 218 fps= 35 q=29.0 size= 222kB time=00:00:05.87 bitrate= 310.3kbits/s frame= 237 fps= 35 q=29.0 size= 245kB time=00:00:06.50 bitrate= 309.1kbits/s frame= 254 fps= 35 q=29.0 size= 267kB time=00:00:07.07 bitrate= 309.7kbits/s frame= 270 fps= 34 q=29.0 size= 285kB time=00:00:07.60 bitrate= 307.2kbits/s frame= 292 fps= 35 q=29.0 size= 314kB time=00:00:08.34 bitrate= 308.5kbits/s frame= 316 fps= 36 q=29.0 size= 334kB time=00:00:09.14 bitrate= 299.3kbits/s frame= 336 fps= 36 q=29.0 size= 356kB time=00:00:09.80 bitrate= 297.0kbits/s frame= 356 fps= 36 q=29.0 size= 381kB time=00:00:10.47 bitrate= 297.9kbits/s frame= 375 fps= 36 q=29.0 size= 405kB time=00:00:11.11 bitrate= 298.5kbits/s frame= 391 fps= 36 q=29.0 size= 431kB time=00:00:11.64 bitrate= 303.5kbits/s frame= 408 fps= 36 q=29.0 size= 456kB time=00:00:12.21 bitrate= 305.8kbits/s frame= 424 fps= 35 q=29.0 size= 479kB time=00:00:12.74 bitrate= 307.8kbits/s frame= 441 fps= 35 q=29.0 size= 503kB time=00:00:13.31 bitrate= 309.3kbits/s frame= 462 fps= 36 q=29.0 size= 526kB time=00:00:14.01 bitrate= 307.4kbits/s frame= 483 fps= 36 q=29.0 size= 546kB time=00:00:14.71 bitrate= 304.2kbits/s frame= 501 fps= 36 q=29.0 size= 583kB time=00:00:15.31 bitrate= 311.9kbits/s frame= 520 fps= 36 q=29.0 size= 609kB time=00:00:15.95 bitrate= 312.7kbits/s frame= 541 fps= 36 q=29.0 size= 636kB time=00:00:16.65 bitrate= 313.1kbits/s frame= 559 fps= 36 q=29.0 size= 668kB time=00:00:17.25 bitrate= 317.3kbits/s frame= 574 fps= 36 q=29.0 size= 698kB time=00:00:17.75 bitrate= 321.9kbits/s frame= 593 fps= 36 q=29.0 size= 732kB time=00:00:18.38 bitrate= 326.1kbits/s frame= 611 fps= 36 q=29.0 size= 760kB time=00:00:18.98 bitrate= 328.0kbits/s frame= 631 fps= 36 q=29.0 size= 788kB time=00:00:19.65 bitrate= 328.5kbits/s frame= 651 fps= 36 q=29.0 size= 817kB time=00:00:20.32 bitrate= 329.2kbits/s frame= 670 fps= 36 q=29.0 size= 842kB time=00:00:20.95 bitrate= 329.0kbits/s frame= 689 fps= 36 q=29.0 size= 868kB time=00:00:21.58 bitrate= 329.4kbits/s frame= 707 fps= 36 q=29.0 size= 896kB time=00:00:22.18 bitrate= 330.8kbits/s frame= 723 fps= 36 q=29.0 size= 924kB time=00:00:22.72 bitrate= 333.0kbits/s frame= 741 fps= 36 q=29.0 size= 955kB time=00:00:23.32 bitrate= 335.4kbits/s frame= 761 fps= 36 q=29.0 size= 999kB time=00:00:23.99 bitrate= 341.0kbits/s frame= 783 fps= 36 q=29.0 size= 1025kB time=00:00:24.72 bitrate= 339.8kbits/s frame= 802 fps= 36 q=29.0 size= 1047kB time=00:00:25.35 bitrate= 338.3kbits/s frame= 821 fps= 36 q=29.0 size= 1076kB time=00:00:25.99 bitrate= 339.3kbits/s frame= 841 fps= 36 q=29.0 size= 1104kB time=00:00:26.66 bitrate= 339.2kbits/s frame= 861 fps= 36 q=29.0 size= 1137kB time=00:00:27.32 bitrate= 340.7kbits/s frame= 881 fps= 36 q=29.0 size= 1164kB time=00:00:27.99 bitrate= 340.7kbits/s frame= 901 fps= 36 q=29.0 size= 1196kB time=00:00:28.66 bitrate= 341.9kbits/s frame= 919 fps= 36 q=29.0 size= 1223kB time=00:00:29.26 bitrate= 342.5kbits/s frame= 939 fps= 36 q=29.0 size= 1259kB time=00:00:29.93 bitrate= 344.7kbits/s frame= 954 fps= 36 q=29.0 size= 1301kB time=00:00:30.43 bitrate= 350.1kbits/s frame= 970 fps= 36 q=29.0 size= 1337kB time=00:00:30.96 bitrate= 353.7kbits/s frame= 988 fps= 36 q=29.0 size= 1373kB time=00:00:31.56 bitrate= 356.3kbits/s frame= 1005 fps= 36 q=29.0 size= 1418kB time=00:00:32.13 bitrate= 361.4kbits/s frame= 1023 fps= 36 q=29.0 size= 1448kB time=00:00:32.73 bitrate= 362.4kbits/s frame= 1040 fps= 36 q=29.0 size= 1483kB time=00:00:33.30 bitrate= 364.9kbits/s frame= 1058 fps= 36 q=29.0 size= 1519kB time=00:00:33.90 bitrate= 367.1kbits/s frame= 1074 fps= 36 q=29.0 size= 1546kB time=00:00:34.43 bitrate= 367.7kbits/s frame= 1091 fps= 36 q=29.0 size= 1573kB time=00:00:35.00 bitrate= 368.3kbits/s frame= 1111 fps= 36 q=29.0 size= 1593kB time=00:00:35.66 bitrate= 365.9kbits/s frame= 1126 fps= 36 q=29.0 size= 1612kB time=00:00:36.17 bitrate= 365.1kbits/s frame= 1140 fps= 36 q=29.0 size= 1637kB time=00:00:36.63 bitrate= 366.1kbits/s frame= 1151 fps= 35 q=29.0 size= 1657kB time=00:00:37.00 bitrate= 366.9kbits/s frame= 1170 fps= 35 q=29.0 size= 1692kB time=00:00:37.63 bitrate= 368.3kbits/s frame= 1190 fps= 35 q=29.0 size= 1724kB time=00:00:38.30 bitrate= 368.6kbits/s frame= 1208 fps= 35 q=29.0 size= 1751kB time=00:00:38.90 bitrate= 368.6kbits/s frame= 1225 fps= 35 q=29.0 size= 1776kB time=00:00:39.47 bitrate= 368.6kbits/s frame= 1242 fps= 35 q=29.0 size= 1806kB time=00:00:40.04 bitrate= 369.4kbits/s frame= 1265 fps= 35 q=29.0 size= 1840kB time=00:00:40.80 bitrate= 369.4kbits/s frame= 1283 fps= 35 q=29.0 size= 1858kB time=00:00:41.40 bitrate= 367.5kbits/s frame= 1298 fps= 35 q=29.0 size= 1874kB time=00:00:41.90 bitrate= 366.3kbits/s frame= 1317 fps= 35 q=29.0 size= 1898kB time=00:00:42.54 bitrate= 365.5kbits/s frame= 1335 fps= 35 q=29.0 size= 1931kB time=00:00:43.14 bitrate= 366.7kbits/s frame= 1353 fps= 35 q=29.0 size= 1966kB time=00:00:43.74 bitrate= 368.2kbits/s frame= 1371 fps= 35 q=29.0 size= 1996kB time=00:00:44.34 bitrate= 368.8kbits/s frame= 1391 fps= 35 q=29.0 size= 2029kB time=00:00:45.01 bitrate= 369.3kbits/s frame= 1410 fps= 35 q=29.0 size= 2062kB time=00:00:45.64 bitrate= 370.2kbits/s frame= 1430 fps= 35 q=29.0 size= 2089kB time=00:00:46.31 bitrate= 369.4kbits/s frame= 1449 fps= 35 q=29.0 size= 2114kB time=00:00:46.94 bitrate= 368.8kbits/s frame= 1469 fps= 35 q=29.0 size= 2140kB time=00:00:47.61 bitrate= 368.1kbits/s frame= 1488 fps= 35 q=29.0 size= 2169kB time=00:00:48.24 bitrate= 368.3kbits/s frame= 1506 fps= 35 q=29.0 size= 2212kB time=00:00:48.84 bitrate= 371.0kbits/s frame= 1522 fps= 35 q=29.0 size= 2248kB time=00:00:49.38 bitrate= 372.8kbits/s frame= 1540 fps= 35 q=29.0 size= 2278kB time=00:00:49.98 bitrate= 373.4kbits/s frame= 1558 fps= 35 q=29.0 size= 2314kB time=00:00:50.58 bitrate= 374.7kbits/s frame= 1577 fps= 35 q=29.0 size= 2346kB time=00:00:51.21 bitrate= 375.2kbits/s frame= 1598 fps= 35 q=29.0 size= 2377kB time=00:00:51.91 bitrate= 375.1kbits/s frame= 1615 fps= 35 q=29.0 size= 2409kB time=00:00:52.48 bitrate= 375.9kbits/s frame= 1633 fps= 35 q=29.0 size= 2440kB time=00:00:53.08 bitrate= 376.4kbits/s frame= 1651 fps= 35 q=29.0 size= 2470kB time=00:00:53.68 bitrate= 376.9kbits/s frame= 1670 fps= 35 q=29.0 size= 2501kB time=00:00:54.32 bitrate= 377.2kbits/s frame= 1690 fps= 35 q=29.0 size= 2539kB time=00:00:54.98 bitrate= 378.3kbits/s frame= 1707 fps= 35 q=29.0 size= 2570kB time=00:00:55.55 bitrate= 378.9kbits/s frame= 1725 fps= 35 q=29.0 size= 2601kB time=00:00:56.15 bitrate= 379.4kbits/s frame= 1743 fps= 35 q=29.0 size= 2632kB time=00:00:56.75 bitrate= 379.8kbits/s frame= 1762 fps= 35 q=29.0 size= 2677kB time=00:00:57.39 bitrate= 382.2kbits/s frame= 1781 fps= 35 q=29.0 size= 2706kB time=00:00:58.02 bitrate= 382.0kbits/s frame= 1800 fps= 35 q=29.0 size= 2738kB time=00:00:58.65 bitrate= 382.3kbits/s frame= 1821 fps= 35 q=29.0 size= 2765kB time=00:00:59.36 bitrate= 381.6kbits/s frame= 1841 fps= 36 q=29.0 size= 2793kB time=00:01:00.02 bitrate= 381.2kbits/s frame= 1857 fps= 35 q=29.0 size= 2822kB time=00:01:00.56 bitrate= 381.7kbits/s frame= 1875 fps= 35 q=29.0 size= 2849kB time=00:01:01.16 bitrate= 381.6kbits/s frame= 1894 fps= 35 q=29.0 size= 2874kB time=00:01:01.79 bitrate= 381.0kbits/s frame= 1914 fps= 35 q=29.0 size= 2900kB time=00:01:02.46 bitrate= 380.4kbits/s frame= 1933 fps= 35 q=29.0 size= 2924kB time=00:01:03.09 bitrate= 379.7kbits/s frame= 1954 fps= 36 q=29.0 size= 2946kB time=00:01:03.79 bitrate= 378.3kbits/s frame= 1974 fps= 36 q=29.0 size= 2971kB time=00:01:04.46 bitrate= 377.5kbits/s frame= 1991 fps= 36 q=29.0 size= 3005kB time=00:01:05.03 bitrate= 378.5kbits/s frame= 2006 fps= 35 q=29.0 size= 3043kB time=00:01:05.53 bitrate= 380.4kbits/s frame= 2024 fps= 35 q=29.0 size= 3074kB time=00:01:06.13 bitrate= 380.8kbits/s frame= 2042 fps= 35 q=29.0 size= 3099kB time=00:01:06.73 bitrate= 380.5kbits/s frame= 2059 fps= 35 q=29.0 size= 3122kB time=00:01:07.30 bitrate= 380.0kbits/s frame= 2077 fps= 35 q=29.0 size= 3149kB time=00:01:07.90 bitrate= 379.9kbits/s frame= 2096 fps= 35 q=29.0 size= 3172kB time=00:01:08.53 bitrate= 379.2kbits/s frame= 2117 fps= 35 q=29.0 size= 3196kB time=00:01:09.23 bitrate= 378.2kbits/s frame= 2129 fps= 35 q=29.0 size= 3214kB time=00:01:09.63 bitrate= 378.0kbits/s frame= 2147 fps= 35 q=29.0 size= 3246kB time=00:01:10.23 bitrate= 378.6kbits/s frame= 2167 fps= 35 q=29.0 size= 3268kB time=00:01:10.90 bitrate= 377.5kbits/s frame= 2185 fps= 35 q=29.0 size= 3298kB time=00:01:11.50 bitrate= 377.8kbits/s frame= 2204 fps= 35 q=29.0 size= 3327kB time=00:01:12.13 bitrate= 377.8kbits/s frame= 2222 fps= 35 q=29.0 size= 3359kB time=00:01:12.74 bitrate= 378.3kbits/s frame= 2242 fps= 35 q=29.0 size= 3386kB time=00:01:13.40 bitrate= 377.9kbits/s frame= 2261 fps= 35 q=29.0 size= 3428kB time=00:01:14.04 bitrate= 379.3kbits/s frame= 2280 fps= 35 q=29.0 size= 3459kB time=00:01:14.67 bitrate= 379.5kbits/s frame= 2299 fps= 35 q=29.0 size= 3494kB time=00:01:15.30 bitrate= 380.1kbits/s frame= 2318 fps= 35 q=29.0 size= 3514kB time=00:01:15.94 bitrate= 379.1kbits/s frame= 2340 fps= 36 q=29.0 size= 3539kB time=00:01:16.67 bitrate= 378.1kbits/s frame= 2360 fps= 36 q=29.0 size= 3563kB time=00:01:17.34 bitrate= 377.4kbits/s frame= 2377 fps= 36 q=29.0 size= 3586kB time=00:01:17.91 bitrate= 377.1kbits/s frame= 2393 fps= 36 q=29.0 size= 3606kB time=00:01:18.44 bitrate= 376.6kbits/s frame= 2410 fps= 35 q=29.0 size= 3625kB time=00:01:19.01 bitrate= 375.9kbits/s frame= 2427 fps= 35 q=29.0 size= 3639kB time=00:01:19.57 bitrate= 374.7kbits/s frame= 2444 fps= 35 q=29.0 size= 3656kB time=00:01:20.14 bitrate= 373.7kbits/s frame= 2461 fps= 35 q=29.0 size= 3680kB time=00:01:20.71 bitrate= 373.5kbits/s frame= 2473 fps= 35 q=29.0 size= 3702kB time=00:01:21.11 bitrate= 373.9kbits/s frame= 2488 fps= 35 q=29.0 size= 3722kB time=00:01:21.61 bitrate= 373.6kbits/s frame= 2506 fps= 35 q=29.0 size= 3764kB time=00:01:22.21 bitrate= 375.0kbits/s frame= 2522 fps= 35 q=29.0 size= 3788kB time=00:01:22.75 bitrate= 375.0kbits/s frame= 2539 fps= 35 q=29.0 size= 3820kB time=00:01:23.31 bitrate= 375.6kbits/s frame= 2556 fps= 35 q=29.0 size= 3851kB time=00:01:23.88 bitrate= 376.1kbits/s frame= 2571 fps= 35 q=29.0 size= 3885kB time=00:01:24.38 bitrate= 377.2kbits/s frame= 2587 fps= 35 q=29.0 size= 3919kB time=00:01:24.91 bitrate= 378.1kbits/s frame= 2600 fps= 35 q=29.0 size= 3949kB time=00:01:25.35 bitrate= 379.0kbits/s frame= 2616 fps= 35 q=29.0 size= 3975kB time=00:01:25.88 bitrate= 379.1kbits/s frame= 2633 fps= 35 q=29.0 size= 4003kB time=00:01:26.45 bitrate= 379.3kbits/s frame= 2653 fps= 35 q=29.0 size= 4029kB time=00:01:27.12 bitrate= 378.9kbits/s frame= 2665 fps= 35 q=29.0 size= 4045kB time=00:01:27.52 bitrate= 378.6kbits/s frame= 2682 fps= 35 q=29.0 size= 4068kB time=00:01:28.08 bitrate= 378.3kbits/s frame= 2701 fps= 35 q=29.0 size= 4084kB time=00:01:28.72 bitrate= 377.1kbits/s frame= 2719 fps= 35 q=29.0 size= 4124kB time=00:01:29.32 bitrate= 378.2kbits/s frame= 2735 fps= 35 q=29.0 size= 4154kB time=00:01:29.85 bitrate= 378.7kbits/s frame= 2753 fps= 35 q=29.0 size= 4201kB time=00:01:30.45 bitrate= 380.5kbits/s frame= 2771 fps= 35 q=29.0 size= 4230kB time=00:01:31.05 bitrate= 380.6kbits/s frame= 2788 fps= 35 q=29.0 size= 4259kB time=00:01:31.62 bitrate= 380.8kbits/s frame= 2805 fps= 35 q=29.0 size= 4287kB time=00:01:32.19 bitrate= 380.9kbits/s frame= 2825 fps= 35 q=29.0 size= 4318kB time=00:01:32.86 bitrate= 380.9kbits/s frame= 2847 fps= 35 q=29.0 size= 4334kB time=00:01:33.59 bitrate= 379.3kbits/s frame= 2866 fps= 35 q=29.0 size= 4371kB time=00:01:34.22 bitrate= 380.0kbits/s frame= 2885 fps= 35 q=29.0 size= 4395kB time=00:01:34.86 bitrate= 379.6kbits/s frame= 2903 fps= 35 q=29.0 size= 4424kB time=00:01:35.46 bitrate= 379.6kbits/s frame= 2921 fps= 35 q=29.0 size= 4450kB time=00:01:36.06 bitrate= 379.5kbits/s frame= 2934 fps= 35 q=29.0 Lsize= 4512kB time=00:01:37.86 bitrate= 377.7kbits/s dup=0 drop=1 video:4454kB audio:0kB global headers:0kB muxing overhead 1.293893% frame I:13 Avg QP:19.66 size: 13557 [libx264 @ 0x95737e0] frame P:1221 Avg QP:23.87 size: 2962 [libx264 @ 0x95737e0] frame B:1700 Avg QP:30.26 size: 451 [libx264 @ 0x95737e0] consecutive B-frames: 7.2% 33.5% 39.7% 19.6% [libx264 @ 0x95737e0] mb I I16..4: 9.6% 73.3% 17.0% [libx264 @ 0x95737e0] mb P I16..4: 0.4% 2.5% 0.4% P16..4: 37.8% 18.9% 8.1% 0.0% 0.0% skip:31.8% [libx264 @ 0x95737e0] mb B I16..4: 0.0% 0.1% 0.0% B16..8: 30.9% 1.9% 0.4% direct: 0.9% skip:65.8% L0:30.8% L1:63.8% BI: 5.4% [libx264 @ 0x95737e0] 8x8 transform intra:74.5% inter:72.0% [libx264 @ 0x95737e0] coded y,uvDC,uvAC intra: 79.7% 84.7% 50.5% inter: 14.2% 13.9% 0.7% [libx264 @ 0x95737e0] i16 v,h,dc,p: 60% 18% 4% 18% [libx264 @ 0x95737e0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 26% 12% 10% 4% 10% 15% 7% 10% 7% [libx264 @ 0x95737e0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 27% 19% 9% 4% 10% 13% 6% 8% 4% [libx264 @ 0x95737e0] i8c dc,h,v,p: 46% 21% 22% 12% [libx264 @ 0x95737e0] Weighted P-Frames: Y:0.8% UV:0.4% [libx264 @ 0x95737e0] ref P L0: 65.4% 20.8% 10.8% 2.9% 0.0% [libx264 @ 0x95737e0] ref B L0: 91.4% 8.0% 0.6% [libx264 @ 0x95737e0] ref B L1: 95.6% 4.4% [libx264 @ 0x95737e0] kb/s:372.66 

Answer 1

这段代码应该收集一行输出然后回显它，重复直到程序退出。 (这对我有用，但只在 Windows 中测试过)

$handle = popen ('/usr/local/bin/ffmpeg -i /home/g/Desktop/cave.wmv -deinterlace -acodec libfaac -ab 96k -ar 44100 -vcodec libx264 -s 480x320 -f flv /home/g/Desktop/file.flv 2>&1', 'r');
$line = "";

while (false !== ($char = fgetc($handle)))
{
  if ($char == "\r")
  {
    // You could now parse the $line for status information.
    echo "$line\n";
    $line = "";
  } else {
    $line .= $char;
  }
  ob_flush();
  flush();
}
pclose ($handle);