Concat 2 .mp4 files created with ffmpeg not working correctly-Collection of common programming errors
slhckI am trying to concat 2 mp4 files that were both created with ffmpeg however the resulting output file does not contain any audio, can someone please help?
Here’s my current code:
function appendVideo($input, $input_second, $outputfolder, $outputname) { // output $output = $outputfolder . $outputname; // intermediate $randomString1 = substr( "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ", mt_rand(0, 50) , 1) .substr( md5( time() ), 1); $randomString2 = substr( "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ", mt_rand(0, 50) , 1) .substr( md5( time() ), 1); $intermediate1 = $outputfolder . "i1_".$randomString1.".mpg"; $intermediate2 = $outputfolder . "i2_".$randomString2.".mpg"; //convert to mpg $exec1 = "ffmpeg -i $input -sameq $intermediate1 2>&1"; $exec2 = "ffmpeg -i $input_second -sameq $intermediate2 2>&1"; exec($exec1,$results1,$return1); exec($exec2,$results2,$return2); // join and convert back $exec = "cat $intermediate1 $intermediate2 | ffmpeg -i - -codec:a copy $output 2>&1"; //delete the intermediate files exec ($exec,$results,$return); if (file_exists ( $intermediate1 )) { unlink ( $intermediate1 ); } if (file_exists ( $intermediate2 )) { unlink ( $intermediate2 ); } return $results; }And this is the result returned from ffmpeg in case it helps:
ffmpeg version 0.10.9 Copyright (c) 2000-2013 the FFmpeg developers built on Oct 1 2013 19:47:54 with gcc 4.4.7 20120313 (Red Hat 4.4.7-3) configuration: --prefix=/usr --bindir=/usr/bin --datadir=/usr/share/ffmpeg --incdir=/usr/include/ffmpeg --libdir=/usr/lib64 --mandir=/usr/share/man --arch=x86_64 --extra-cflags='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic' --enable-bzlib --disable-crystalhd --enable-gnutls --enable-libass --enable-libcdio --enable-libcelt --enable-libdc1394 --disable-indev=jack --enable-libfreetype --enable-libgsm --enable-libmp3lame --enable-openal --enable-libopenjpeg --enable-libpulse --enable-librtmp --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-libv4l2 --enable-libx264 --enable-libxvid --enable-x11grab --enable-avfilter --enable-postproc --enable-pthreads --disable-static --enable-shared --enable-gpl --disable-debug --disable-stripping --shlibdir=/usr/lib64 --enable-runtime-cpudetect libavutil 51. 35.100 / 51. 35.100 libavcodec 53. 61.100 / 53. 61.100 libavformat 53. 32.100 / 53. 32.100 libavdevice 53. 4.100 / 53. 4.100 libavfilter 2. 61.100 / 2. 61.100 libswscale 2. 1.100 / 2. 1.100 libswresample 0. 6.100 / 0. 6.100 libpostproc 52. 0.100 / 52. 0.100 mpeg @ 0x111afc0] Estimating duration from bitrate, this may be inaccurate nput #0, mpeg, from 'pipe:': Duration: N/A, start: 1.000000, bitrate: 104985 kb/s Stream #0:0[0x1e0]: Video: mpeg1video, yuv420p, 768x432 [SAR 1:1 DAR 16:9], 104857 kb/s, 30 fps, 30 tbr, 90k tbn, 30 tbc Stream #0:1[0x1c0]: Audio: mp2, 44100 Hz, stereo, s16, 128 kb/s buffer @ 0x1137280] w:768 h:432 pixfmt:yuv420p tb:1/1000000 sar:1/1 sws_param: libx264 @ 0x11221e0] using SAR=1/1 libx264 @ 0x11221e0] using cpu capabilities: none! libx264 @ 0x11221e0] profile High, level 3.0 libx264 @ 0x11221e0] 264 - core 120 r2151 a3f4407 - 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=12 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=0 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 utput #0, mp4, to 'tmp/zdee7489be42d6db4bfe9ce8e67da161.mp4': Metadata: encoder : Lavf53.32.100 Stream #0:0: Video: h264 (![0][0][0] / 0x0021), yuv420p, 768x432 [SAR 1:1 DAR 16:9], q=-1--1, 30 tbn, 30 tbc Stream #0:1: Audio: mp2 (i[0][0][0] / 0x0069), 44100 Hz, stereo, 128 kb/s Stream mapping: Stream #0:0 -> #0:0 (mpeg1video -> libx264) Stream #0:1 -> #0:1 (copy) frame= 46 fps= 0 q=0.0 size= 0kB time=00:00:00.00 bitrate= 0.0kbits/s frame= 66 fps= 60 q=29.0 size= 135kB time=00:00:00.26 bitrate=4141.1kbits/s frame= 79 fps= 49 q=29.0 size= 257kB time=00:00:00.70 bitrate=3011.9kbits/s frame= 93 fps= 44 q=29.0 size= 386kB time=00:00:01.16 bitrate=2711.4kbits/s ... frame= 105 fps= 39 q=29.0 size= 487kideo:14440kB audio:3140kB global headers:0kB muxing overhead 1.021247% [libx264 @ 0x11221e0] frame I:31 Avg QP:18.84 size: 42581 [libx264 @ 0x11221e0] frame P:3369 Avg QP:21.98 size: 3277 [libx264 @ 0x11221e0] frame B:2629 Avg QP:27.40 size: 923 [libx264 @ 0x11221e0] consecutive B-frames: 37.1% 14.2% 0.5% 48.2% [libx264 @ 0x11221e0] mb I I16..4: 7.6% 68.7% 23.6% [libx264 @ 0x11221e0] mb P I16..4: 0.6% 1.5% 0.2% P16..4: 20.9% 7.1% 5.3% 0.0% 0.0% skip:64.3% [libx264 @ 0x11221e0] mb B I16..4: 0.1% 0.1% 0.0% B16..8: 17.2% 3.2% 1.0% direct: 0.7% skip:77.6% L0:39.4% L1:51.8% BI: 8.8% [libx264 @ 0x11221e0] 8x8 transform intra:64.8% inter:69.2% [libx264 @ 0x11221e0] coded y,uvDC,uvAC intra: 57.6% 72.7% 35.5% inter: 7.6% 11.8% 0.6% [libx264 @ 0x11221e0] i16 v,h,dc,p: 41% 21% 16% 21% [libx264 @ 0x11221e0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 23% 21% 30% 5% 3% 3% 5% 4% 7% [libx264 @ 0x11221e0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 31% 23% 12% 4% 5% 5% 7% 6% 6% [libx264 @ 0x11221e0] i8c dc,h,v,p: 44% 24% 25% 7% [libx264 @ 0x11221e0] Weighted P-Frames: Y:0.7% UV:0.5% [libx264 @ 0x11221e0] ref P L0: 69.8% 12.5% 10.8% 6.8% 0.0% [libx264 @ 0x11221e0] ref B L0: 89.9% 8.5% 1.6% [libx264 @ 0x11221e0] ref B L1: 97.2% 2.8% [libx264 @ 0x11221e0] kb/s:588.6
slhckI can only guess here as to what you’re trying to achieve, but the immediate solution to your problem would be to use
-c:a aac -strict experimentalinstead of-codec:a copy. Your .mpg files use themp2audio codec which is apparently not supported in an MP4 container.But then again, there are quite a few things wrong here. By converting to
.mpgwithout any additional options you’re creating MPEG-1 video, which either results in horrible quality, or terribly huge files. Also,-sameqdoesn’t do what you expect it to do. Please forget that option. Lastly, the double conversion introduces quality loss.First, update to a recent version of
ffmpeg. Then, read the guide at How to concatenate (join, merge) media files, especially the part about theconcatfilter. There you could concatenate two files directly without needing intermediates.
Nate
