我正在尝试从android中的ffmpeg命令读取输出。我一直在尝试这个:
try {
Process process = Runtime.getRuntime().exec("data/data/com.extremeye/cache/ffmpeg" + " -i " + videoPath + " -y " + framesPath + "%d.jpg");
BufferedReader bufferedReader = new BufferedReader(
new InputStreamReader(process.getInputStream()));
StringBuilder log = new StringBuilder();
String line;
while ((line = bufferedReader.readLine()) != null) {
log.append(line + "\n");
}
Log.d(TAG, log.toString());
} catch (IOException e) {
}
例如,当命令是“ls / data / data / package / cache”时,它可以工作,但它不会从我的ffmpeg命令中检索我想要的数据。我想要的数据应该是:
但是当我使用我的代码时,它不会检索任何数据。
现在,我正在使用来自答案的新代码,它似乎有效但不是真的。我明白了:
[format @ 0xee7450] auto-inserting filter 'auto-inserted scaler 0' between the filter 'src' and the filter 'format'
[scale @ 0xee85f0] w:1280 h:720 fmt:yuv420p sar:1/1 -> w:1280 h:720 fmt:yuvj420p sar:1/1 flags:0x4
Output #0, image2, to '/data/data/com.extremeye/cache/frames/%d.jpg':
Metadata:
major_brand : mp42
minor_version : 0
compatible_brands: mp41isom
creation_time : 2013-11-20 14:45:01
encoder : Lavf54.6.100
Stream #0:0(und): Video: mjpeg, yuvj420p, 1280x720 [SAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 90k tbn, 30 tbc
Metadata:
creation_time : 2013-11-20 14:45:01
handler_name : VideoHandler
Stream mapping:
Stream #0:0 -> #0:0 (h264 -> mjpeg)
Press [q] to stop, [?] for help
frame= 3 fps=1.1 q=2.0 size= 0kB time=00:00:00.10 bitrate= 0.0kbits/s
frame= 5 fps=1.5 q=5.0 size= 0kB time=00:00:00.16 bitrate= 0.0kbits/s
frame= 7 fps=1.8 q=10.2 size= 0kB time=00:00:00.23 bitrate= 0.0kbits/s
frame= 9 fps=1.9 q=16.0 size= 0kB time=00:00:00.30 bitrate= 0.0kbits/s
frame= 11 fps=1.9 q=21.9 size= 0kB time=00:00:00.36 bitrate= 0.0kbits/s
frame= 12 fps=1.3 q=24.8 size= 0kB time=00:00:00.40 bitrate= 0.0kbits/s
frame= 13 fps=1.0 q=24.8 size= 0kB time=00:00:00.43 bitrate= 0.0kbits/s
frame= 14 fps=1.0 q=24.8 size= 0kB time=00:00:00.46 bitrate= 0.0kbits/s
frame= 15 fps=1.1 q=24.8 size= 0kB time=00:00:00.50 bitrate= 0.0kbits/s
frame= 17 fps=1.1 q=24.8 size= 0kB time=00:00:00.56 bitrate= 0.0kbits/s
frame= 19 fps=1.2 q=24.8 size= 0kB time=00:00:00.63 bitrate= 0.0kbits/s
frame= 21 fps=1.3 q=24.8 size= 0kB time=00:00:00.70 bitrate= 0.0kbits/s
frame= 23 fps=1.4 q=24.8 size= 0kB time=00:00:00.76 bitrate= 0.0kbits/s
frame= 25 fps=1.4 q=24.8 size=
数据检索突然中断,我不知道为什么......有什么想法吗?
答案 0 :(得分:3)
ffmpeg打印是stderr的消息,你正在捕获stdout。使用getErrorStream()