如何拼接不同分辨率的视频？FFmpeg设置DAR后仍报错

Hey there! Adding setdar=16/9 is a solid first step to align aspect ratios, but FFmpeg's concat filter has stricter requirements than just matching display aspect ratio. Let's break down the common issues and fix your command.

Why Your Current Command Fails #

The concat filter requires both videos to have identical video resolution, pixel format, frame rate, and audio parameters (sampling rate, channel count, etc.). Even if DAR matches, mismatches in any of these will throw an error.

Step 1: Check Your Video/Audio Parameters First #

Run this command to get detailed specs for both videos:

ffmpeg -i /var/www/html/GetVideo/reklam/muzikli1.mp4 -i /var/www/html/GetVideo/tempvideo/sample.mp4

Look for these key values to compare:

• Video: Resolution (e.g., 1920x1080), Frame rate, Pixel format (e.g., yuv420p)
• Audio: Sample rate (e.g., 44100 Hz), Channels (e.g., stereo)

Step 2: Unified Command to Match All Parameters #

Use this revised command to standardize every required parameter before concatenation. Replace the resolution/fps/audio values with what you found in Step 1:

ffmpeg -i /var/www/html/GetVideo/reklam/muzikli1.mp4 -i /var/www/html/GetVideo/tempvideo/sample.mp4 -filter_complex \
"[0:v]setdar=16/9,scale=1920:1080,fps=30,format=yuv420p[v0]; \
 [1:v]setdar=16/9,scale=1920:1080,fps=30,format=yuv420p[v1]; \
 [0:a]aformat=sample_rates=44100:channel_layouts=stereo[a0]; \
 [1:a]aformat=sample_rates=44100:channel_layouts=stereo[a1]; \
 [v0][a0][v1][a1]concat=n=2:v=1:a=1[v][a]" \
-map "[v]" -map "[a]" -c:v libx264 -c:a aac /var/www/html/GetVideo/reklam/out.mp4

Let's break down what each part does:

• scale=1920:1080: Forces both videos to the same pixel resolution (adjust to match your source videos)
• fps=30: Unifies frame rate (use the frame rate from your source videos)
• format=yuv420p: Sets a universally compatible pixel format
• aformat: Matches audio sampling rate and channel layout
• -c:v libx264 -c:a aac: Ensures the output uses widely supported encoders

Step 3: If You Still Get Errors #

If the command above doesn't work, try these checks:

• Verify that both videos have no corrupted frames (use ffmpeg -v error -i input.mp4 -f null - to scan for errors)
• If one video has variable frame rate (VFR), the fps=30 filter in the command will convert it to constant frame rate, which fixes most VFR-related concat issues

内容的提问来源于stack exchange，提问作者mcan